{"id":102081,"date":"2026-09-08T07:24:57","date_gmt":"2026-09-07T23:24:57","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/102081.html"},"modified":"2026-09-08T07:24:57","modified_gmt":"2026-09-07T23:24:57","slug":"%e3%80%90rust%e5%85%a5%e9%97%a8%e7%9f%a5%e8%af%86%e7%82%b9%e3%80%91%e7%ac%ac23%e8%af%be%ef%bc%9a%e8%bf%ad%e4%bb%a3%e5%99%a8-iterators","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/102081.html","title":{"rendered":"\u3010Rust\u5165\u95e8\u77e5\u8bc6\u70b9\u3011\u7b2c23\u8bfe\uff1a\u8fed\u4ee3\u5668 Iterators"},"content":{"rendered":"

\u77e5\u8bc6\u70b9：\u8fed\u4ee3\u5668\u57fa\u7840<\/h2>\n

Rust \u7684\u8fed\u4ee3\u5668\u662f\u60f0\u6027\u7684\u2014\u2014\u521b\u5efa\u8fed\u4ee3\u5668\u672c\u8eab\u4e0d\u505a\u4efb\u4f55\u4e8b，\u53ea\u6709\u6d88\u8d39\u5b83\u65f6\u624d\u4ea7\u751f\u503c：<\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n let<\/span> numbers =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>]<\/span>;<\/span><\/p>\n

\/\/ \u4e09\u79cd\u8fed\u4ee3\u65b9\u5f0f<\/span>
\n \/\/ 1. iter()：\u4e0d\u53ef\u53d8\u501f\u7528<\/span>
\n for<\/span> n in<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span> {<\/span>
\n print!<\/span>(<\/span>"{} "<\/span>,<\/span> n)<\/span>;<\/span> \/\/ 1 2 3 4 5<\/span>
\n }<\/span>
\n println!<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

\/\/ 2. iter_mut()：\u53ef\u53d8\u501f\u7528<\/span>
\n let<\/span> mut<\/span> nums =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>;<\/span>
\n for<\/span> n in<\/span> nums.<\/span>iter_mut<\/span>(<\/span>)<\/span> {<\/span>
\n *<\/span>n *=<\/span> 10<\/span>;<\/span>
\n }<\/span>
\n println!<\/span>(<\/span>"\u53ef\u53d8\u8fed\u4ee3: {:?}"<\/span>,<\/span> nums)<\/span>;<\/span> \/\/ [10, 20, 30]<\/span><\/p>\n

\/\/ 3. into_iter()：\u83b7\u53d6\u6240\u6709\u6743（\u6d88\u8d39\u96c6\u5408）<\/span>
\n let<\/span> words =<\/span> vec!<\/span>[<\/span>String<\/span>::<\/span>from<\/span>(<\/span>"hello"<\/span>)<\/span>,<\/span> String<\/span>::<\/span>from<\/span>(<\/span>"world"<\/span>)<\/span>]<\/span>;<\/span>
\n for<\/span> w in<\/span> words.<\/span>into_iter<\/span>(<\/span>)<\/span> {<\/span>
\n println!<\/span>(<\/span>"\u5355\u8bcd: {}"<\/span>,<\/span> w)<\/span>;<\/span>
\n }<\/span>
\n \/\/ println!("{:?}", words); \/\/ \u274c words \u5df2\u88ab\u6d88\u8d39<\/span><\/p>\n

\/\/ \u624b\u52a8\u4f7f\u7528\u8fed\u4ee3\u5668<\/span>
\n let<\/span> mut<\/span> iter =<\/span> vec!<\/span>[<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>]<\/span>.<\/span>into_iter<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"{:?}"<\/span>,<\/span> iter.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ Some(10)<\/span>
\n println!<\/span>(<\/span>"{:?}"<\/span>,<\/span> iter.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ Some(20)<\/span>
\n println!<\/span>(<\/span>"{:?}"<\/span>,<\/span> iter.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ Some(30)<\/span>
\n println!<\/span>(<\/span>"{:?}"<\/span>,<\/span> iter.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ None<\/span>
\n}<\/span><\/p>\n

\u77e5\u8bc6\u70b9：\u8fed\u4ee3\u5668\u9002\u914d\u5668（Adaptor）<\/h2>\n

\u9002\u914d\u5668\u6d88\u8d39\u4e00\u4e2a\u8fed\u4ee3\u5668，\u8fd4\u56de\u4e00\u4e2a\u65b0\u8fed\u4ee3\u5668\u3002\u5b83\u4eec\u662f\u60f0\u6027\u7684，\u4e0d\u4f1a\u7acb\u5373\u6267\u884c：<\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n let<\/span> numbers =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>,<\/span> 6<\/span>,<\/span> 7<\/span>,<\/span> 8<\/span>,<\/span> 9<\/span>,<\/span> 10<\/span>]<\/span>;<\/span><\/p>\n

\/\/ map：\u5bf9\u6bcf\u4e2a\u5143\u7d20\u505a\u53d8\u6362<\/span>
\n let<\/span> doubled:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>map<\/span>(<\/span>|<\/span>x|<\/span><\/span> x *<\/span> 2<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u7ffb\u500d: {:?}"<\/span>,<\/span> doubled)<\/span>;<\/span><\/p>\n

\/\/ filter：\u8fc7\u6ee4\u5143\u7d20<\/span>
\n let<\/span> evens:<\/span> Vec<\/span><<\/span>&<\/span>i32<\/span>><\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>filter<\/span>(<\/span>|<\/span>x|<\/span><\/span> *<\/span>x %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u5076\u6570: {:?}"<\/span>,<\/span> evens)<\/span>;<\/span><\/p>\n

\/\/ enumerate：\u9644\u5e26\u7d22\u5f15<\/span>
\n let<\/span> indexed:<\/span> Vec<\/span><<\/span>(<\/span>usize<\/span>,<\/span> &<\/span>i32<\/span>)<\/span>><\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>enumerate<\/span>(<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u5e26\u7d22\u5f15: {:?}"<\/span>,<\/span> indexed)<\/span>;<\/span><\/p>\n

\/\/ zip：\u628a\u4e24\u4e2a\u8fed\u4ee3\u5668\u914d\u5bf9<\/span>
\n let<\/span> names =<\/span> vec!<\/span>[<\/span>"Alice"<\/span>,<\/span> "Bob"<\/span>,<\/span> "Charlie"<\/span>]<\/span>;<\/span>
\n let<\/span> scores =<\/span> vec!<\/span>[<\/span>90<\/span>,<\/span> 85<\/span>,<\/span> 95<\/span>]<\/span>;<\/span>
\n let<\/span> paired:<\/span> Vec<\/span><<\/span>(<\/span>&&<\/span>str<\/span>,<\/span> &<\/span>i32<\/span>)<\/span>><\/span> =<\/span> names.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>zip<\/span>(<\/span>scores.<\/span>iter<\/span>(<\/span>)<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u914d\u5bf9: {:?}"<\/span>,<\/span> paired)<\/span>;<\/span><\/p>\n

\/\/ take \/ skip<\/span>
\n let<\/span> first_three:<\/span> Vec<\/span><<\/span>&<\/span>i32<\/span>><\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>take<\/span>(<\/span>3<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n let<\/span> skip_two:<\/span> Vec<\/span><<\/span>&<\/span>i32<\/span>><\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>skip<\/span>(<\/span>2<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u524d3\u4e2a: {:?}"<\/span>,<\/span> first_three)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u8df3\u8fc72\u4e2a: {:?}"<\/span>,<\/span> skip_two)<\/span>;<\/span><\/p>\n

\/\/ chain：\u8fde\u63a5\u4e24\u4e2a\u8fed\u4ee3\u5668<\/span>
\n let<\/span> a =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>;<\/span>
\n let<\/span> b =<\/span> vec!<\/span>[<\/span>4<\/span>,<\/span> 5<\/span>,<\/span> 6<\/span>]<\/span>;<\/span>
\n let<\/span> chained:<\/span> Vec<\/span><<\/span>&<\/span>i32<\/span>><\/span> =<\/span> a.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>chain<\/span>(<\/span>b.<\/span>iter<\/span>(<\/span>)<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u8fde\u63a5: {:?}"<\/span>,<\/span> chained)<\/span>;<\/span><\/p>\n

\/\/ peekable：\u53ef\u7aa5\u89c6\u7684\u8fed\u4ee3\u5668<\/span>
\n let<\/span> mut<\/span> peekable =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>.<\/span>into_iter<\/span>(<\/span>)<\/span>.<\/span>peekable<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u7aa5\u89c6: {:?}"<\/span>,<\/span> peekable.<\/span>peek<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ Some(1)，\u4e0d\u6d88\u8d39<\/span>
\n println!<\/span>(<\/span>"\u4e0b\u4e00\u4e2a: {:?}"<\/span>,<\/span> peekable.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ Some(1)，\u6d88\u8d39\u4e86<\/span>
\n println!<\/span>(<\/span>"\u518d\u7aa5\u89c6: {:?}"<\/span>,<\/span> peekable.<\/span>peek<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ Some(2)<\/span>
\n}<\/span><\/p>\n

\u77e5\u8bc6\u70b9：\u6d88\u8d39\u9002\u914d\u5668（Consumer）<\/h2>\n

\u6d88\u8d39\u9002\u914d\u5668\u4f1a\u6267\u884c\u8fed\u4ee3\u5e76\u4ea7\u751f\u6700\u7ec8\u503c：<\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n let<\/span> numbers =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>,<\/span> 6<\/span>,<\/span> 7<\/span>,<\/span> 8<\/span>,<\/span> 9<\/span>,<\/span> 10<\/span>]<\/span>;<\/span><\/p>\n

\/\/ fold：\u5e26\u521d\u59cb\u503c\u7684\u7d2f\u79ef<\/span>
\n let<\/span> sum:<\/span> i32<\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>fold<\/span>(<\/span>0<\/span>,<\/span> |<\/span>acc,<\/span> x|<\/span><\/span> acc +<\/span> x)<\/span>;<\/span>
\n println!<\/span>(<\/span>"fold \u6c42\u548c: {}"<\/span>,<\/span> sum)<\/span>;<\/span> \/\/ 55<\/span><\/p>\n

\/\/ reduce：\u4e0d\u5e26\u521d\u59cb\u503c（\u8fd4\u56de Option）<\/span>
\n let<\/span> max:<\/span> Option<\/span><<\/span>&<\/span>i32<\/span>><\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>reduce<\/span>(<\/span>|<\/span>a,<\/span> b|<\/span><\/span> if<\/span> a ><\/span> b {<\/span> a }<\/span> else<\/span> {<\/span> b }<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"reduce \u6700\u5927\u503c: {:?}"<\/span>,<\/span> max)<\/span>;<\/span><\/p>\n

\/\/ count：\u8ba1\u6570<\/span>
\n let<\/span> count =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>filter<\/span>(<\/span>|<\/span>x|<\/span><\/span> *<\/span>x %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span>.<\/span>count<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u5076\u6570\u4e2a\u6570: {}"<\/span>,<\/span> count)<\/span>;<\/span> \/\/ 5<\/span><\/p>\n

\/\/ sum \/ product<\/span>
\n let<\/span> sum:<\/span> i32<\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>sum<\/span>(<\/span>)<\/span>;<\/span>
\n let<\/span> product:<\/span> i32<\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>product<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"sum: {}, product: {}"<\/span>,<\/span> sum,<\/span> product)<\/span>;<\/span><\/p>\n

\/\/ any \/ all<\/span>
\n let<\/span> has_even =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>any<\/span>(<\/span>|<\/span>x|<\/span><\/span> x %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span>;<\/span>
\n let<\/span> all_positive =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>all<\/span>(<\/span>|<\/span>x|<\/span><\/span> *<\/span>x ><\/span> 0<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u6709\u5076\u6570: {}, \u5168\u6b63\u6570: {}"<\/span>,<\/span> has_even,<\/span> all_positive)<\/span>;<\/span><\/p>\n

\/\/ find：\u627e\u5230\u7b2c\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684<\/span>
\n let<\/span> first_big =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>find<\/span>(<\/span>|<\/span>&&<\/span>x|<\/span><\/span> x ><\/span> 7<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u7b2c\u4e00\u4e2a\u5927\u4e8e7\u7684: {:?}"<\/span>,<\/span> first_big)<\/span>;<\/span> \/\/ Some(8)<\/span><\/p>\n

\/\/ position：\u627e\u5230\u7b2c\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u7d22\u5f15<\/span>
\n let<\/span> pos =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>position<\/span>(<\/span>|<\/span>&<\/span>x|<\/span><\/span> x ><\/span> 7<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u7b2c\u4e00\u4e2a\u5927\u4e8e7\u7684\u7d22\u5f15: {:?}"<\/span>,<\/span> pos)<\/span>;<\/span> \/\/ Some(7)<\/span><\/p>\n

\/\/ min \/ max<\/span>
\n let<\/span> min =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>min<\/span>(<\/span>)<\/span>;<\/span>
\n let<\/span> max =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>max<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u6700\u5c0f: {:?}, \u6700\u5927: {:?}"<\/span>,<\/span> min,<\/span> max)<\/span>;<\/span><\/p>\n

\/\/ for_each：\u5bf9\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u64cd\u4f5c（\u4e0d\u4ea7\u751f\u65b0\u503c）<\/span>
\n numbers.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>for_each<\/span>(<\/span>|<\/span>x|<\/span><\/span> print!<\/span>(<\/span>"{} "<\/span>,<\/span> x)<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u77e5\u8bc6\u70b9：\u94fe\u5f0f\u8c03\u7528<\/h2>\n

\u8fed\u4ee3\u5668\u6700\u5f3a\u5927\u7684\u5730\u65b9\u662f\u53ef\u4ee5\u94fe\u5f0f\u7ec4\u5408\u591a\u4e2a\u64cd\u4f5c：<\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n let<\/span> numbers =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>,<\/span> 6<\/span>,<\/span> 7<\/span>,<\/span> 8<\/span>,<\/span> 9<\/span>,<\/span> 10<\/span>]<\/span>;<\/span><\/p>\n

\/\/ \u94fe\u5f0f\u8c03\u7528：\u8fc7\u6ee4 -> \u53d8\u6362 -> \u6536\u96c6<\/span>
\n let<\/span> result:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>filter<\/span>(<\/span>|<\/span>x|<\/span><\/span> *<\/span>x %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span> \/\/ \u5076\u6570<\/span>
\n .<\/span>map<\/span>(<\/span>|<\/span>x|<\/span><\/span> x *<\/span> x)<\/span> \/\/ \u5e73\u65b9<\/span>
\n .<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u5076\u6570\u7684\u5e73\u65b9: {:?}"<\/span>,<\/span> result)<\/span>;<\/span> \/\/ [4, 16, 36, 64, 100]<\/span><\/p>\n

\/\/ \u590d\u6742\u94fe\u5f0f：\u6c42\u5076\u6570\u7684\u5e73\u65b9\u548c<\/span>
\n let<\/span> sum_of_squares:<\/span> i32<\/span> =<\/span> numbers.<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>filter<\/span>(<\/span>|<\/span>x|<\/span><\/span> *<\/span>x %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span>
\n .<\/span>map<\/span>(<\/span>|<\/span>x|<\/span><\/span> x *<\/span> x)<\/span>
\n .<\/span>sum<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u5076\u6570\u7684\u5e73\u65b9\u548c: {}"<\/span>,<\/span> sum_of_squares)<\/span>;<\/span> \/\/ 220<\/span><\/p>\n

\/\/ flatMap：\u5c55\u5e73\u5d4c\u5957\u96c6\u5408<\/span>
\n let<\/span> nested =<\/span> vec!<\/span>[<\/span>vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>,<\/span> vec!<\/span>[<\/span>4<\/span>,<\/span> 5<\/span>]<\/span>,<\/span> vec!<\/span>[<\/span>6<\/span>,<\/span> 7<\/span>,<\/span> 8<\/span>,<\/span> 9<\/span>]<\/span>]<\/span>;<\/span>
\n let<\/span> flat:<\/span> Vec<\/span><<\/span>&<\/span>i32<\/span>><\/span> =<\/span> nested.<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>flat_map<\/span>(<\/span>|<\/span>inner|<\/span><\/span> inner.<\/span>iter<\/span>(<\/span>)<\/span>)<\/span>
\n .<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u5c55\u5e73: {:?}"<\/span>,<\/span> flat)<\/span>;<\/span><\/p>\n

\/\/ \u5b9e\u6218：\u7edf\u8ba1\u4e00\u6bb5\u6587\u672c\u4e2d\u6bcf\u4e2a\u5355\u8bcd\u51fa\u73b0\u7684\u6b21\u6570<\/span>
\n let<\/span> text =<\/span> "hello world hello rust world hello"<\/span>;<\/span>
\n let<\/span> mut<\/span> word_counts =<\/span> std::<\/span>collections::<\/span><\/span>HashMap<\/span>::<\/span>new<\/span>(<\/span>)<\/span>;<\/span>
\n text.<\/span>split_whitespace<\/span>(<\/span>)<\/span>
\n .<\/span>for_each<\/span>(<\/span>|<\/span>word|<\/span><\/span> {<\/span>
\n *<\/span>word_counts.<\/span>entry<\/span>(<\/span>word)<\/span>.<\/span>or_insert<\/span>(<\/span>0<\/span>)<\/span> +=<\/span> 1<\/span>;<\/span>
\n }<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u8bcd\u9891: {:?}"<\/span>,<\/span> word_counts)<\/span>;<\/span><\/p>\n

\/\/ \u5b9e\u6218：\u627e\u5230\u6210\u7ee9\u6700\u9ad8\u7684\u5b66\u751f<\/span>
\n let<\/span> students =<\/span> vec!<\/span>[<\/span>
\n (<\/span>"Alice"<\/span>,<\/span> 85<\/span>)<\/span>,<\/span>
\n (<\/span>"Bob"<\/span>,<\/span> 92<\/span>)<\/span>,<\/span>
\n (<\/span>"Charlie"<\/span>,<\/span> 78<\/span>)<\/span>,<\/span>
\n (<\/span>"Diana"<\/span>,<\/span> 95<\/span>)<\/span>,<\/span>
\n ]<\/span>;<\/span>
\n let<\/span> best =<\/span> students.<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>max_by_key<\/span>(<\/span>|<\/span>&&<\/span>(<\/span>_,<\/span> score)<\/span>|<\/span><\/span> score)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u6700\u9ad8\u5206\u5b66\u751f: {:?}"<\/span>,<\/span> best)<\/span>;<\/span><\/p>\n

\/\/ \u5b9e\u6218：\u5206\u7ec4\u7edf\u8ba1<\/span>
\n let<\/span> scores =<\/span> vec!<\/span>[<\/span>45<\/span>,<\/span> 82<\/span>,<\/span> 91<\/span>,<\/span> 67<\/span>,<\/span> 55<\/span>,<\/span> 73<\/span>,<\/span> 88<\/span>,<\/span> 34<\/span>,<\/span> 96<\/span>,<\/span> 61<\/span>]<\/span>;<\/span>
\n let<\/span> (<\/span>pass,<\/span> fail)<\/span>:<\/span> (<\/span>Vec<\/span><<\/span>&<\/span>i32<\/span>><\/span>,<\/span> Vec<\/span><<\/span>&<\/span>i32<\/span>><\/span>)<\/span> =<\/span> scores.<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>partition<\/span>(<\/span>|<\/span>&&<\/span>score|<\/span><\/span> score >=<\/span> 60<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u53ca\u683c: {:?}"<\/span>,<\/span> pass)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u4e0d\u53ca\u683c: {:?}"<\/span>,<\/span> fail)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u77e5\u8bc6\u70b9：\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668<\/h2>\n

\u5b9e\u73b0 Iterator trait \u6765\u521b\u5efa\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668：<\/p>\n

\/\/ \u81ea\u5b9a\u4e49：\u6590\u6ce2\u90a3\u5951\u6570\u5217\u8fed\u4ee3\u5668<\/span>
\nstruct<\/span> Fibonacci<\/span> {<\/span>
\n a:<\/span> u64<\/span>,<\/span>
\n b:<\/span> u64<\/span>,<\/span>
\n}<\/span><\/p>\n

impl<\/span> Fibonacci<\/span> {<\/span>
\n fn<\/span> new<\/span>(<\/span>)<\/span> -><\/span> Self<\/span> {<\/span>
\n Fibonacci<\/span> {<\/span> a:<\/span> 0<\/span>,<\/span> b:<\/span> 1<\/span> }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

impl<\/span> Iterator<\/span> for<\/span> Fibonacci<\/span> {<\/span>
\n type<\/span> Item<\/span> =<\/span> u64<\/span>;<\/span><\/p>\n

fn<\/span> next<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span> -><\/span> Option<\/span><<\/span>Self<\/span>::<\/span>Item<\/span>><\/span> {<\/span>
\n let<\/span> result =<\/span> self<\/span>.<\/span>a;<\/span>
\n let<\/span> new_b =<\/span> self<\/span>.<\/span>a +<\/span> self<\/span>.<\/span>b;<\/span>
\n self<\/span>.<\/span>a =<\/span> self<\/span>.<\/span>b;<\/span>
\n self<\/span>.<\/span>b =<\/span> new_b;<\/span>
\n Some<\/span>(<\/span>result)<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\/\/ \u81ea\u5b9a\u4e49：\u8303\u56f4\u8fed\u4ee3\u5668（\u7c7b\u4f3c std::ops::Range）<\/span>
\nstruct<\/span> MyRange<\/span> {<\/span>
\n current:<\/span> i32<\/span>,<\/span>
\n end:<\/span> i32<\/span>,<\/span>
\n}<\/span><\/p>\n

impl<\/span> MyRange<\/span> {<\/span>
\n fn<\/span> new<\/span>(<\/span>start:<\/span> i32<\/span>,<\/span> end:<\/span> i32<\/span>)<\/span> -><\/span> Self<\/span> {<\/span>
\n MyRange<\/span> {<\/span> current:<\/span> start,<\/span> end }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

impl<\/span> Iterator<\/span> for<\/span> MyRange<\/span> {<\/span>
\n type<\/span> Item<\/span> =<\/span> i32<\/span>;<\/span><\/p>\n

fn<\/span> next<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span> -><\/span> Option<\/span><<\/span>Self<\/span>::<\/span>Item<\/span>><\/span> {<\/span>
\n if<\/span> self<\/span>.<\/span>current <<\/span> self<\/span>.<\/span>end {<\/span>
\n let<\/span> result =<\/span> self<\/span>.<\/span>current;<\/span>
\n self<\/span>.<\/span>current +=<\/span> 1<\/span>;<\/span>
\n Some<\/span>(<\/span>result)<\/span>
\n }<\/span> else<\/span> {<\/span>
\n None<\/span>
\n }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n \/\/ \u4f7f\u7528\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668<\/span>
\n let<\/span> fibs:<\/span> Vec<\/span><<\/span>u64<\/span>><\/span> =<\/span> Fibonacci<\/span>::<\/span>new<\/span>(<\/span>)<\/span>.<\/span>take<\/span>(<\/span>10<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u6590\u6ce2\u90a3\u5951: {:?}"<\/span>,<\/span> fibs)<\/span>;<\/span>
\n \/\/ [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]<\/span><\/p>\n

\/\/ \u6590\u6ce2\u90a3\u5951\u6570\u5217\u4e2d\u5076\u6570\u9879\u7684\u548c（\u5c0f\u4e8e100）<\/span>
\n let<\/span> even_fib_sum:<\/span> u64<\/span> =<\/span> Fibonacci<\/span>::<\/span>new<\/span>(<\/span>)<\/span>
\n .<\/span>take_while<\/span>(<\/span>|<\/span>&<\/span>x|<\/span><\/span> x <<\/span> 100<\/span>)<\/span>
\n .<\/span>filter<\/span>(<\/span>|<\/span>x|<\/span><\/span> x %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span>
\n .<\/span>sum<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u5c0f\u4e8e100\u7684\u5076\u6570\u6590\u6ce2\u90a3\u5951\u548c: {}"<\/span>,<\/span> even_fib_sum)<\/span>;<\/span><\/p>\n

\/\/ \u4f7f\u7528\u81ea\u5b9a\u4e49\u8303\u56f4<\/span>
\n let<\/span> range:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> MyRange<\/span>::<\/span>new<\/span>(<\/span>1<\/span>,<\/span> 6<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u81ea\u5b9a\u4e49\u8303\u56f4: {:?}"<\/span>,<\/span> range)<\/span>;<\/span> \/\/ [1, 2, 3, 4, 5]<\/span><\/p>\n

\/\/ \u8fed\u4ee3\u5668\u53ef\u4ee5\u7528\u4e8e for \u5faa\u73af<\/span>
\n for<\/span> n in<\/span> MyRange<\/span>::<\/span>new<\/span>(<\/span>1<\/span>,<\/span> 4<\/span>)<\/span> {<\/span>
\n print!<\/span>(<\/span>"{} "<\/span>,<\/span> n)<\/span>;<\/span>
\n }<\/span>
\n println!<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u6838\u5fc3\u89c4\u5219<\/h2>\n

\u6982\u5ff5 \u5199\u6cd5 \u4e0d\u53ef\u53d8\u8fed\u4ee3 collection.iter() \u53ef\u53d8\u8fed\u4ee3 collection.iter_mut() \u6240\u6709\u6743\u8fed\u4ee3 collection.into_iter() \u53d8\u6362 .map( x \u2026) \u8fc7\u6ee4 .filter( x \u2026) \u7d2f\u79ef .fold(init, acc, x \u2026) \u6536\u96c6 .collect() \u5c55\u5e73 .flat_map( x \u2026) \u5206\u7ec4 .partition( x \u2026) \u67e5\u627e .find( x \u2026) \/ .position( x \u2026) \u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668 impl Iterator for MyType { type Item = T; fn next(\u2026) } \u60f0\u6027\u6c42\u503c \u9002\u914d\u5668\u4e0d\u6267\u884c，\u6d88\u8d39\u5668\u89e6\u53d1\u6267\u884c<\/p>\n

\u52a8\u624b\u8bd5\u8bd5<\/h2>\n

\u8865\u5168\u4e0b\u9762\u7684\u4ee3\u7801：<\/p>\n

\/\/ \u8865\u5168：\u5b9a\u4e49\u4e00\u4e2a\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668 Counter<\/span>
\n\/\/ \u4ece start \u5f00\u59cb，\u6bcf\u6b21\u9012\u589e step<\/span>
\n\/\/ \u5f53\u503c\u8d85\u8fc7 end \u65f6\u505c\u6b62（\u4e0d\u542b end）<\/span>
\n\/\/ \u4f8b\u5982 Counter::new(0, 10, 3) \u4ea7\u751f 0, 3, 6, 9<\/span>
\nstruct<\/span> Counter<\/span> {<\/span>
\n \/\/ \u8865\u5168\u5b57\u6bb5<\/span>
\n}<\/span><\/p>\n

impl<\/span> Counter<\/span> {<\/span>
\n fn<\/span> new<\/span>(<\/span>start:<\/span> i32<\/span>,<\/span> end:<\/span> i32<\/span>,<\/span> step:<\/span> i32<\/span>)<\/span> -><\/span> Self<\/span> {<\/span>
\n \/\/ \u8865\u5168<\/span>
\n todo!<\/span>(<\/span>)<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\/\/ \u8865\u5168：\u4e3a Counter \u5b9e\u73b0 Iterator trait<\/span>
\n\/\/ type Item = i32<\/span><\/p>\n

\/\/ \u8865\u5168：\u5b9e\u73b0\u51fd\u6570 top_n_scores<\/span>
\n\/\/ \u63a5\u53d7\u4e00\u4e2a (\u59d3\u540d, \u5206\u6570) \u7684\u5207\u7247\u548c n<\/span>
\n\/\/ \u8fd4\u56de\u5206\u6570\u6700\u9ad8\u7684 n \u4e2a\u5b66\u751f\u7684\u59d3\u540d（\u6309\u5206\u6570\u4ece\u9ad8\u5230\u4f4e）<\/span>
\nfn<\/span> top_n_scores<\/span><<\/span>'a<\/span>><\/span>(<\/span>students:<\/span> &<\/span>'a<\/span> [<\/span>(<\/span>&<\/span>'a<\/span> str<\/span>,<\/span> i32<\/span>)<\/span>]<\/span>,<\/span> n:<\/span> usize<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>&<\/span>'a<\/span> str<\/span>><\/span> {<\/span>
\n \/\/ \u8865\u5168：\u7528\u8fed\u4ee3\u5668\u94fe\u5f0f\u8c03\u7528\u5b9e\u73b0<\/span>
\n \/\/ \u63d0\u793a：sorted_by_key \u6216 sort + iter<\/span>
\n todo!<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

\/\/ \u8865\u5168：\u5b9e\u73b0\u51fd\u6570 group_by_length<\/span>
\n\/\/ \u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\u5207\u7247，\u6309\u5b57\u7b26\u4e32\u957f\u5ea6\u5206\u7ec4<\/span>
\n\/\/ \u8fd4\u56de HashMap<usize, Vec<&str>>，\u952e\u4e3a\u957f\u5ea6，\u503c\u4e3a\u8be5\u957f\u5ea6\u7684\u6240\u6709\u5b57\u7b26\u4e32<\/span>
\nfn<\/span> group_by_length<\/span><<\/span>'a<\/span>><\/span>(<\/span>words:<\/span> &<\/span>'a<\/span> [<\/span>&<\/span>'a<\/span> str<\/span>]<\/span>)<\/span> -><\/span> std::<\/span>collections::<\/span><\/span>HashMap<\/span><<\/span>usize<\/span>,<\/span> Vec<\/span><<\/span>&<\/span>'a<\/span> str<\/span>>><\/span> {<\/span>
\n \/\/ \u8865\u5168：\u7528\u8fed\u4ee3\u5668\u5b9e\u73b0<\/span>
\n todo!<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

\/\/ \u8865\u5168：\u5b9e\u73b0\u51fd\u6570 running_average<\/span>
\n\/\/ \u63a5\u53d7\u4e00\u4e2a\u6d6e\u70b9\u6570\u5207\u7247，\u8fd4\u56de\u6bcf\u4e2a\u4f4d\u7f6e\u4e3a\u6b62\u7684_running average<\/span>
\n\/\/ \u4f8b\u5982 [1.0, 3.0, 5.0] => [1.0, 2.0, 3.0]<\/span>
\n\/\/ \u7b2c1\u4e2a: 1.0\/1 = 1.0<\/span>
\n\/\/ \u7b2c2\u4e2a: (1.0+3.0)\/2 = 2.0<\/span>
\n\/\/ \u7b2c3\u4e2a: (1.0+3.0+5.0)\/3 = 3.0<\/span>
\nfn<\/span> running_average<\/span>(<\/span>numbers:<\/span> &<\/span>[<\/span>f64<\/span>]<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>f64<\/span>><\/span> {<\/span>
\n \/\/ \u8865\u5168：\u7528\u8fed\u4ee3\u5668\u7684 scan \u6216 enumerate + map \u5b9e\u73b0<\/span>
\n todo!<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n \/\/ \u6d4b\u8bd5 Counter<\/span>
\n let<\/span> counter:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> Counter<\/span>::<\/span>new<\/span>(<\/span>0<\/span>,<\/span> 10<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"Counter(0,10,3): {:?}"<\/span>,<\/span> counter)<\/span>;<\/span>
\n \/\/ \u671f\u671b: [0, 3, 6, 9]<\/span><\/p>\n

let<\/span> counter2:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> Counter<\/span>::<\/span>new<\/span>(<\/span>1<\/span>,<\/span> 20<\/span>,<\/span> 5<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"Counter(1,20,5): {:?}"<\/span>,<\/span> counter2)<\/span>;<\/span>
\n \/\/ \u671f\u671b: [1, 6, 11, 16]<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 top_n_scores<\/span>
\n let<\/span> students =<\/span> vec!<\/span>[<\/span>
\n (<\/span>"Alice"<\/span>,<\/span> 85<\/span>)<\/span>,<\/span>
\n (<\/span>"Bob"<\/span>,<\/span> 92<\/span>)<\/span>,<\/span>
\n (<\/span>"Charlie"<\/span>,<\/span> 78<\/span>)<\/span>,<\/span>
\n (<\/span>"Diana"<\/span>,<\/span> 95<\/span>)<\/span>,<\/span>
\n (<\/span>"Eve"<\/span>,<\/span> 88<\/span>)<\/span>,<\/span>
\n ]<\/span>;<\/span>
\n let<\/span> top2 =<\/span> top_n_scores<\/span>(<\/span>&<\/span>students,<\/span> 2<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u524d2\u540d: {:?}"<\/span>,<\/span> top2)<\/span>;<\/span>
\n \/\/ \u671f\u671b: ["Diana", "Bob"]<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 group_by_length<\/span>
\n let<\/span> words =<\/span> vec!<\/span>[<\/span>"hi"<\/span>,<\/span> "hello"<\/span>,<\/span> "hey"<\/span>,<\/span> "world"<\/span>,<\/span> "ok"<\/span>,<\/span> "rust"<\/span>]<\/span>;<\/span>
\n let<\/span> grouped =<\/span> group_by_length<\/span>(<\/span>&<\/span>words)<\/span>;<\/span>
\n \/\/ \u8865\u5168：\u6309\u957f\u5ea6\u6392\u5e8f\u6253\u5370<\/span>
\n \/\/ \u671f\u671b:<\/span>
\n \/\/ \u957f\u5ea62: ["hi", "ok"]<\/span>
\n \/\/ \u957f\u5ea63: ["hey"]<\/span>
\n \/\/ \u957f\u5ea64: ["rust"]<\/span>
\n \/\/ \u957f\u5ea65: ["hello", "world"]<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 running_average<\/span>
\n let<\/span> nums =<\/span> vec!<\/span>[<\/span>1.0<\/span>,<\/span> 3.0<\/span>,<\/span> 5.0<\/span>,<\/span> 7.0<\/span>,<\/span> 9.0<\/span>]<\/span>;<\/span>
\n let<\/span> avgs =<\/span> running_average<\/span>(<\/span>&<\/span>nums)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u79fb\u52a8\u5e73\u5747: {:?}"<\/span>,<\/span> avgs)<\/span>;<\/span>
\n \/\/ \u671f\u671b: [1.0, 2.0, 3.0, 4.0, 5.0]<\/span>
\n}<\/span><\/p>\n

\u671f\u671b\u8f93\u51fa： Counter(0,10,3): [0, 3, 6, 9] Counter(1,20,5): [1, 6, 11, 16] \u524d2\u540d: [\u201cDiana\u201d, \u201cBob\u201d] \u957f\u5ea62: [\u201chi\u201d, \u201cok\u201d] \u957f\u5ea63: [\u201chey\u201d] \u957f\u5ea64: [\u201crust\u201d] \u957f\u5ea65: [\u201chello\u201d, \u201cworld\u201d] \u79fb\u52a8\u5e73\u5747: [1.0, 2.0, 3.0, 4.0, 5.0]<\/p>\n

\u5199\u597d\u4e86\u8d34\u8fc7\u6765，\u6ca1\u95ee\u9898\u5c31\u8fdb\u5165\u7b2c24\u8bfe：\u751f\u547d\u5468\u671f Lifetimes 👋<\/p>\n

\u8d34\u4ee3\u7801<\/h2>\n

use<\/span> std::<\/span>collections::<\/span><\/span>HashMap<\/span>;<\/span><\/p>\n

\/\/ \u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668 Counter<\/span>
\nstruct<\/span> Counter<\/span> {<\/span>
\n current:<\/span> i32<\/span>,<\/span>
\n end:<\/span> i32<\/span>,<\/span>
\n step:<\/span> i32<\/span>,<\/span>
\n}<\/span><\/p>\n

impl<\/span> Counter<\/span> {<\/span>
\n fn<\/span> new<\/span>(<\/span>start:<\/span> i32<\/span>,<\/span> end:<\/span> i32<\/span>,<\/span> step:<\/span> i32<\/span>)<\/span> -><\/span> Self<\/span> {<\/span>
\n Counter<\/span> {<\/span>
\n current:<\/span> start,<\/span>
\n end,<\/span>
\n step,<\/span>
\n }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\/\/ \u5b9e\u73b0 Iterator trait<\/span>
\nimpl<\/span> Iterator<\/span> for<\/span> Counter<\/span> {<\/span>
\n type<\/span> Item<\/span> =<\/span> i32<\/span>;<\/span><\/p>\n

fn<\/span> next<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span> -><\/span> Option<\/span><<\/span>Self<\/span>::<\/span>Item<\/span>><\/span> {<\/span>
\n if<\/span> self<\/span>.<\/span>current >=<\/span> self<\/span>.<\/span>end {<\/span>
\n return<\/span> None<\/span>;<\/span>
\n }<\/span>
\n let<\/span> val =<\/span> self<\/span>.<\/span>current;<\/span>
\n self<\/span>.<\/span>current +=<\/span> self<\/span>.<\/span>step;<\/span>
\n Some<\/span>(<\/span>val)<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\/\/\/ \u83b7\u53d6\u5206\u6570\u6700\u9ad8\u524dn\u540d\u5b66\u751f\u59d3\u540d（\u5206\u6570\u964d\u5e8f）<\/span>
\nfn<\/span> top_n_scores<\/span><<\/span>'a<\/span>><\/span>(<\/span>students:<\/span> &<\/span>'a<\/span> [<\/span>(<\/span>&<\/span>'a<\/span> str<\/span>,<\/span> i32<\/span>)<\/span>]<\/span>,<\/span> n:<\/span> usize<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>&<\/span>'a<\/span> str<\/span>><\/span> {<\/span>
\n students
\n .<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>sort_by_key<\/span>(<\/span>|<\/span>(<\/span>_,<\/span> score)<\/span>|<\/span><\/span> std::<\/span>cmp::<\/span><\/span>Reverse<\/span>(<\/span>*<\/span>score)<\/span>)<\/span>;<\/span>
\n students
\n .<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>take<\/span>(<\/span>n)<\/span>
\n .<\/span>map<\/span>(<\/span>|<\/span>(<\/span>name,<\/span> _)<\/span>|<\/span><\/span> *<\/span>name)<\/span>
\n .<\/span>collect<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

\/\/\/ \u6309\u5b57\u7b26\u4e32\u957f\u5ea6\u5206\u7ec4<\/span>
\nfn<\/span> group_by_length<\/span><<\/span>'a<\/span>><\/span>(<\/span>words:<\/span> &<\/span>'a<\/span> [<\/span>&<\/span>'a<\/span> str<\/span>]<\/span>)<\/span> -><\/span> HashMap<\/span><<\/span>usize<\/span>,<\/span> Vec<\/span><<\/span>&<\/span>'a<\/span> str<\/span>>><\/span> {<\/span>
\n words.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>fold<\/span>(<\/span>HashMap<\/span>::<\/span>new<\/span>(<\/span>)<\/span>,<\/span> |<\/span>mut<\/span> map,<\/span> w|<\/span><\/span> {<\/span>
\n map.<\/span>entry<\/span>(<\/span>w.<\/span>len<\/span>(<\/span>)<\/span>)<\/span>.<\/span>or_default<\/span>(<\/span>)<\/span>.<\/span>push<\/span>(<\/span>*<\/span>w)<\/span>;<\/span>
\n map
\n }<\/span>)<\/span>
\n}<\/span><\/p>\n

\/\/\/ \u524d\u7f00（\u6eda\u52a8）\u5e73\u5747\u503c，\u4f7f\u7528scan\u5b9e\u73b0<\/span>
\nfn<\/span> running_average<\/span>(<\/span>numbers:<\/span> &<\/span>[<\/span>f64<\/span>]<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>f64<\/span>><\/span> {<\/span>
\n numbers
\n .<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>scan<\/span>(<\/span>(<\/span>0.0<\/span>,<\/span> 0<\/span>)<\/span>,<\/span> |<\/span>(<\/span>sum,<\/span> count)<\/span>,<\/span> &<\/span>val|<\/span><\/span> {<\/span>
\n *<\/span>sum +=<\/span> val;<\/span>
\n *<\/span>count +=<\/span> 1<\/span>;<\/span>
\n Some<\/span>(<\/span>*<\/span>sum \/<\/span> (<\/span>*<\/span>count as<\/span> f64<\/span>)<\/span>)<\/span>
\n }<\/span>)<\/span>
\n .<\/span>collect<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n \/\/ \u6d4b\u8bd5 Counter<\/span>
\n let<\/span> counter:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> Counter<\/span>::<\/span>new<\/span>(<\/span>0<\/span>,<\/span> 10<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"Counter(0,10,3): {:?}"<\/span>,<\/span> counter)<\/span>;<\/span><\/p>\n

let<\/span> counter2:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> Counter<\/span>::<\/span>new<\/span>(<\/span>1<\/span>,<\/span> 20<\/span>,<\/span> 5<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"Counter(1,20,5): {:?}"<\/span>,<\/span> counter2)<\/span>;<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 top_n_scores<\/span>
\n let<\/span> mut<\/span> students =<\/span> vec!<\/span>[<\/span>
\n (<\/span>"Alice"<\/span>,<\/span> 85<\/span>)<\/span>,<\/span>
\n (<\/span>"Bob"<\/span>,<\/span> 92<\/span>)<\/span>,<\/span>
\n (<\/span>"Charlie"<\/span>,<\/span> 78<\/span>)<\/span>,<\/span>
\n (<\/span>"Diana"<\/span>,<\/span> 95<\/span>)<\/span>,<\/span>
\n (<\/span>"Eve"<\/span>,<\/span> 88<\/span>)<\/span>,<\/span>
\n ]<\/span>;<\/span>
\n let<\/span> top2 =<\/span> {<\/span>
\n let<\/span> mut<\/span> tmp =<\/span> students.<\/span>clone<\/span>(<\/span>)<\/span>;<\/span>
\n tmp.<\/span>sort_by_key<\/span>(<\/span>|<\/span>(<\/span>_,<\/span> s)<\/span>|<\/span><\/span> std::<\/span>cmp::<\/span><\/span>Reverse<\/span>(<\/span>*<\/span>s)<\/span>)<\/span>;<\/span>
\n tmp.<\/span>into_iter<\/span>(<\/span>)<\/span>.<\/span>take<\/span>(<\/span>2<\/span>)<\/span>.<\/span>map<\/span>(<\/span>|<\/span>(<\/span>n,<\/span> _)<\/span>|<\/span><\/span> n)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>
\n }<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u524d2\u540d: {:?}"<\/span>,<\/span> top2)<\/span>;<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 group_by_length<\/span>
\n let<\/span> words =<\/span> vec!<\/span>[<\/span>"hi"<\/span>,<\/span> "hello"<\/span>,<\/span> "hey"<\/span>,<\/span> "world"<\/span>,<\/span> "ok"<\/span>,<\/span> "rust"<\/span>]<\/span>;<\/span>
\n let<\/span> grouped =<\/span> group_by_length<\/span>(<\/span>&<\/span>words)<\/span>;<\/span>
\n let<\/span> mut<\/span> keys:<\/span> Vec<\/span><<\/span>usize<\/span>><\/span> =<\/span> grouped.<\/span>keys<\/span>(<\/span>)<\/span>.<\/span>cloned<\/span>(<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n keys.<\/span>sort_unstable<\/span>(<\/span>)<\/span>;<\/span>
\n for<\/span> k in<\/span> keys {<\/span>
\n println!<\/span>(<\/span>"\u957f\u5ea6{}: {:?}"<\/span>,<\/span> k,<\/span> grouped[<\/span>&<\/span>k]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 running_average<\/span>
\n let<\/span> nums =<\/span> vec!<\/span>[<\/span>1.0<\/span>,<\/span> 3.0<\/span>,<\/span> 5.0<\/span>,<\/span> 7.0<\/span>,<\/span> 9.0<\/span>]<\/span>;<\/span>
\n let<\/span> avgs =<\/span> running_average<\/span>(<\/span>&<\/span>nums)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u79fb\u52a8\u5e73\u5747: {:?}"<\/span>,<\/span> avgs)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u4fee\u6b63\u8bf4\u660e：\u539f\u6765 top_n_scores \u76f4\u63a5\u5bf9\u5207\u7247\u8c03\u7528 sort_by_key，sort\u4f1a\u5c31\u5730\u4fee\u6539，\u800c\u5207\u7247\u662f\u4e0d\u53ef\u53d8\u5f15\u7528，\u7f16\u8bd1\u62a5\u9519\u3002\u4e0a\u9762 main \u91cc\u505a\u4e86\u4e00\u4efd\u62f7\u8d1d\u518d\u6392\u5e8f；\u5982\u679c\u4f60\u5e0c\u671b\u51fd\u6570\u5185\u90e8\u5b8c\u6574\u5b9e\u73b0\u7248\u672c（\u4e0d\u6c61\u67d3\u5916\u90e8），\u4e0b\u9762\u7ed9 top_n_scores \u7684\u6700\u7ec8\u7248：<\/p>\n

fn<\/span> top_n_scores<\/span><<\/span>'a<\/span>><\/span>(<\/span>students:<\/span> &<\/span>'a<\/span> [<\/span>(<\/span>&<\/span>'a<\/span> str<\/span>,<\/span> i32<\/span>)<\/span>]<\/span>,<\/span> n:<\/span> usize<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>&<\/span>'a<\/span> str<\/span>><\/span> {<\/span>
\n let<\/span> mut<\/span> v:<\/span> Vec<\/span><<\/span>_><\/span> =<\/span> students.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n v.<\/span>sort_by_key<\/span>(<\/span>|<\/span>(<\/span>_,<\/span> score)<\/span>|<\/span><\/span> std::<\/span>cmp::<\/span><\/span>Reverse<\/span>(<\/span>*<\/span>*<\/span>score)<\/span>)<\/span>;<\/span>
\n v.<\/span>into_iter<\/span>(<\/span>)<\/span>.<\/span>take<\/span>(<\/span>n)<\/span>.<\/span>map<\/span>(<\/span>|<\/span>(<\/span>name,<\/span> _)<\/span>|<\/span><\/span> *<\/span>name)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

\u628a top_n_scores \u66ff\u6362\u6210\u8fd9\u4e2a\u7248\u672c，main\u5c31\u53ef\u4ee5\u7b80\u5316\u4e3a：<\/p>\n

let<\/span> top2 =<\/span> top_n_scores<\/span>(<\/span>&<\/span>students,<\/span> 2<\/span>)<\/span>;<\/span><\/p>\n

\u5b8c\u6574\u6700\u7ec8\u7248（\u5168\u90e8\u51fd\u6570\u81ea\u5305\u542b，main\u5e72\u51c0）<\/p>\n

use<\/span> std::<\/span>collections::<\/span><\/span>HashMap<\/span>;<\/span><\/p>\n

\/\/ \u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668 Counter<\/span>
\nstruct<\/span> Counter<\/span> {<\/span>
\n current:<\/span> i32<\/span>,<\/span>
\n end:<\/span> i32<\/span>,<\/span>
\n step:<\/span> i32<\/span>,<\/span>
\n}<\/span><\/p>\n

impl<\/span> Counter<\/span> {<\/span>
\n fn<\/span> new<\/span>(<\/span>start:<\/span> i32<\/span>,<\/span> end:<\/span> i32<\/span>,<\/span> step:<\/span> i32<\/span>)<\/span> -><\/span> Self<\/span> {<\/span>
\n Counter<\/span> {<\/span>
\n current:<\/span> start,<\/span>
\n end,<\/span>
\n step,<\/span>
\n }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

impl<\/span> Iterator<\/span> for<\/span> Counter<\/span> {<\/span>
\n type<\/span> Item<\/span> =<\/span> i32<\/span>;<\/span><\/p>\n

fn<\/span> next<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span> -><\/span> Option<\/span><<\/span>Self<\/span>::<\/span>Item<\/span>><\/span> {<\/span>
\n if<\/span> self<\/span>.<\/span>current >=<\/span> self<\/span>.<\/span>end {<\/span>
\n return<\/span> None<\/span>;<\/span>
\n }<\/span>
\n let<\/span> val =<\/span> self<\/span>.<\/span>current;<\/span>
\n self<\/span>.<\/span>current +=<\/span> self<\/span>.<\/span>step;<\/span>
\n Some<\/span>(<\/span>val)<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

fn<\/span> top_n_scores<\/span><<\/span>'a<\/span>><\/span>(<\/span>students:<\/span> &<\/span>'a<\/span> [<\/span>(<\/span>&<\/span>'a<\/span> str<\/span>,<\/span> i32<\/span>)<\/span>]<\/span>,<\/span> n:<\/span> usize<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>&<\/span>'a<\/span> str<\/span>><\/span> {<\/span>
\n let<\/span> mut<\/span> v:<\/span> Vec<\/span><<\/span>_><\/span> =<\/span> students.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n v.<\/span>sort_by_key<\/span>(<\/span>|<\/span>(<\/span>_,<\/span> score)<\/span>|<\/span><\/span> std::<\/span>cmp::<\/span><\/span>Reverse<\/span>(<\/span>*<\/span>*<\/span>score)<\/span>)<\/span>;<\/span>
\n v.<\/span>into_iter<\/span>(<\/span>)<\/span>.<\/span>take<\/span>(<\/span>n)<\/span>.<\/span>map<\/span>(<\/span>|<\/span>(<\/span>name,<\/span> _)<\/span>|<\/span><\/span> *<\/span>name)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

fn<\/span> group_by_length<\/span><<\/span>'a<\/span>><\/span>(<\/span>words:<\/span> &<\/span>'a<\/span> [<\/span>&<\/span>'a<\/span> str<\/span>]<\/span>)<\/span> -><\/span> HashMap<\/span><<\/span>usize<\/span>,<\/span> Vec<\/span><<\/span>&<\/span>'a<\/span> str<\/span>>><\/span> {<\/span>
\n words.<\/span>iter<\/span>(<\/span>)<\/span>.<\/span>fold<\/span>(<\/span>HashMap<\/span>::<\/span>new<\/span>(<\/span>)<\/span>,<\/span> |<\/span>mut<\/span> map,<\/span> w|<\/span><\/span> {<\/span>
\n map.<\/span>entry<\/span>(<\/span>w.<\/span>len<\/span>(<\/span>)<\/span>)<\/span>.<\/span>or_default<\/span>(<\/span>)<\/span>.<\/span>push<\/span>(<\/span>*<\/span>w)<\/span>;<\/span>
\n map
\n }<\/span>)<\/span>
\n}<\/span><\/p>\n

fn<\/span> running_average<\/span>(<\/span>numbers:<\/span> &<\/span>[<\/span>f64<\/span>]<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>f64<\/span>><\/span> {<\/span>
\n numbers
\n .<\/span>iter<\/span>(<\/span>)<\/span>
\n .<\/span>scan<\/span>(<\/span>(<\/span>0.0<\/span>,<\/span> 0<\/span>)<\/span>,<\/span> |<\/span>(<\/span>sum,<\/span> count)<\/span>,<\/span> &<\/span>val|<\/span><\/span> {<\/span>
\n *<\/span>sum +=<\/span> val;<\/span>
\n *<\/span>count +=<\/span> 1<\/span>;<\/span>
\n Some<\/span>(<\/span>*<\/span>sum \/<\/span> (<\/span>*<\/span>count as<\/span> f64<\/span>)<\/span>)<\/span>
\n }<\/span>)<\/span>
\n .<\/span>collect<\/span>(<\/span>)<\/span>
\n}<\/span><\/p>\n

fn<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n \/\/ \u6d4b\u8bd5 Counter<\/span>
\n let<\/span> counter:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> Counter<\/span>::<\/span>new<\/span>(<\/span>0<\/span>,<\/span> 10<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"Counter(0,10,3): {:?}"<\/span>,<\/span> counter)<\/span>;<\/span><\/p>\n

let<\/span> counter2:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> Counter<\/span>::<\/span>new<\/span>(<\/span>1<\/span>,<\/span> 20<\/span>,<\/span> 5<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"Counter(1,20,5): {:?}"<\/span>,<\/span> counter2)<\/span>;<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 top_n_scores<\/span>
\n let<\/span> students =<\/span> vec!<\/span>[<\/span>
\n (<\/span>"Alice"<\/span>,<\/span> 85<\/span>)<\/span>,<\/span>
\n (<\/span>"Bob"<\/span>,<\/span> 92<\/span>)<\/span>,<\/span>
\n (<\/span>"Charlie"<\/span>,<\/span> 78<\/span>)<\/span>,<\/span>
\n (<\/span>"Diana"<\/span>,<\/span> 95<\/span>)<\/span>,<\/span>
\n (<\/span>"Eve"<\/span>,<\/span> 88<\/span>)<\/span>,<\/span>
\n ]<\/span>;<\/span>
\n let<\/span> top2 =<\/span> top_n_scores<\/span>(<\/span>&<\/span>students,<\/span> 2<\/span>)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u524d2\u540d: {:?}"<\/span>,<\/span> top2)<\/span>;<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 group_by_length<\/span>
\n let<\/span> words =<\/span> vec!<\/span>[<\/span>"hi"<\/span>,<\/span> "hello"<\/span>,<\/span> "hey"<\/span>,<\/span> "world"<\/span>,<\/span> "ok"<\/span>,<\/span> "rust"<\/span>]<\/span>;<\/span>
\n let<\/span> grouped =<\/span> group_by_length<\/span>(<\/span>&<\/span>words)<\/span>;<\/span>
\n let<\/span> mut<\/span> keys:<\/span> Vec<\/span><<\/span>usize<\/span>><\/span> =<\/span> grouped.<\/span>keys<\/span>(<\/span>)<\/span>.<\/span>cloned<\/span>(<\/span>)<\/span>.<\/span>collect<\/span>(<\/span>)<\/span>;<\/span>
\n keys.<\/span>sort_unstable<\/span>(<\/span>)<\/span>;<\/span>
\n for<\/span> k in<\/span> keys {<\/span>
\n println!<\/span>(<\/span>"\u957f\u5ea6{}: {:?}"<\/span>,<\/span> k,<\/span> grouped[<\/span>&<\/span>k]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ \u6d4b\u8bd5 running_average<\/span>
\n let<\/span> nums =<\/span> vec!<\/span>[<\/span>1.0<\/span>,<\/span> 3.0<\/span>,<\/span> 5.0<\/span>,<\/span> 7.0<\/span>,<\/span> 9.0<\/span>]<\/span>;<\/span>
\n let<\/span> avgs =<\/span> running_average<\/span>(<\/span>&<\/span>nums)<\/span>;<\/span>
\n println!<\/span>(<\/span>"\u79fb\u52a8\u5e73\u5747: {:?}"<\/span>,<\/span> avgs)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u8fd0\u884c\u8f93\u51fa<\/p>\n

plaintext<\/p>\n

Counter(0,10,3): [0, 3, 6, 9] Counter(1,20,5): [1, 6, 11, 16] \u524d2\u540d: [\u201cDiana\u201d, \u201cBob\u201d] \u957f\u5ea62: [\u201chi\u201d, \u201cok\u201d] \u957f\u5ea63: [\u201chey\u201d] \u957f\u5ea64: [\u201crust\u201d] \u957f\u5ea65: [\u201chello\u201d, \u201cworld\u201d] \u79fb\u52a8\u5e73\u5747: [1.0, 2.0, 3.0, 4.0, 5.0]<\/p>\n

\u77e5\u8bc6\u70b9<\/h2>\n

1. \u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668 Counter \u5b9e\u73b0 Iterator ，Item = i32；next() \u8fd4\u56de Option，\u72b6\u6001\u4fdd\u5b58\u5728\u7ed3\u6784\u4f53\u5b57\u6bb5\u3002\u8c03\u7528 .collect() \u81ea\u52a8\u628a\u8fed\u4ee3\u5668\u8f6c\u4e3aVec\u3002 2. top_n_scores \u5207\u7247\u4e0d\u53ef\u53d8，\u5148\u628a\u8fed\u4ee3\u5668\u6536\u96c6\u6210\u4e34\u65f6Vec\u518d\u6392\u5e8f， Reverse \u5b9e\u73b0\u964d\u5e8f；take(n)\u53d6\u524dN\u6761\u3002 3. group_by_length fold \u662f\u4e07\u80fd\u7684\u8fed\u4ee3\u5668\u805a\u5408；entry\u2011or_default \u5206\u7ec4\u6807\u51c6\u5199\u6cd5\u3002 4. running_average（scan） scan \u4fdd\u5b58\u7d2f\u52a0\u72b6\u6001（sum,count），\u6bcf\u4e00\u6b65\u4ea7\u51fa\u4e00\u4e2a\u503c，\u975e\u5e38\u9002\u5408\u524d\u7f00\u548c\u3001\u6eda\u52a8\u5e73\u5747\u573a\u666f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u77e5\u8bc6\u70b9：\u8fed\u4ee3\u5668\u57fa\u7840
\nRust \u7684\u8fed\u4ee3\u5668\u662f\u60f0\u6027\u7684\u2014\u2014\u521b\u5efa\u8fed\u4ee3\u5668\u672c\u8eab\u4e0d\u505a\u4efb\u4f55\u4e8b，\u53ea\u6709\u6d88\u8d39\u5b83\u65f6\u624d\u4ea7\u751f\u503c：
\nfn main() {let numbers vec![1, 2, 3, 4, 5];\/\/ \u4e09\u79cd\u8fed\u4ee3\u65b9\u5f0f\/\/ 1. iter()：\u4e0d\u53ef\u53d8\u501f\u7528for n in numbers.iter() {print!(\\”{} \\”, n); \/\/ 1 2 3 4 5}println!();\/\/ 2. iter_mut()&#xff<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[206,371,190],"topic":[],"class_list":["post-102081","post","type-post","status-publish","format-standard","hentry","category-server","tag-rust","tag-371","tag-190"],"yoast_head":"\n\u3010Rust\u5165\u95e8\u77e5\u8bc6\u70b9\u3011\u7b2c23\u8bfe\uff1a\u8fed\u4ee3\u5668 Iterators - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/102081.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Rust\u5165\u95e8\u77e5\u8bc6\u70b9\u3011\u7b2c23\u8bfe\uff1a\u8fed\u4ee3\u5668 Iterators - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u77e5\u8bc6\u70b9：\u8fed\u4ee3\u5668\u57fa\u7840 Rust \u7684\u8fed\u4ee3\u5668\u662f\u60f0\u6027\u7684\u2014\u2014\u521b\u5efa\u8fed\u4ee3\u5668\u672c\u8eab\u4e0d\u505a\u4efb\u4f55\u4e8b，\u53ea\u6709\u6d88\u8d39\u5b83\u65f6\u624d\u4ea7\u751f\u503c： fn main() {let numbers vec![1, 2, 3, 4, 5];\/\/ \u4e09\u79cd\u8fed\u4ee3\u65b9\u5f0f\/\/ 1. iter()：\u4e0d\u53ef\u53d8\u501f\u7528for n in numbers.iter() {print!("{} ", n); 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\/\/ 1 2 3 4 5}println!();\/\/ 2. iter_mut()&#xff","og_url":"https:\/\/www.wsisp.com\/helps\/102081.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-09-07T23:24:57+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"9 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/102081.html","url":"https:\/\/www.wsisp.com\/helps\/102081.html","name":"\u3010Rust\u5165\u95e8\u77e5\u8bc6\u70b9\u3011\u7b2c23\u8bfe\uff1a\u8fed\u4ee3\u5668 Iterators - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-09-07T23:24:57+00:00","dateModified":"2026-09-07T23:24:57+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/102081.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/102081.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/102081.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"\u3010Rust\u5165\u95e8\u77e5\u8bc6\u70b9\u3011\u7b2c23\u8bfe\uff1a\u8fed\u4ee3\u5668 Iterators"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/102081","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=102081"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/102081\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=102081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=102081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=102081"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=102081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}