\u8fd9\u4e09\u79cd\u573a\u666f\u7684\u5171\u540c\u70b9\u662f：\u503c\u4e0d\u5e94\u8be5\u63d0\u524d\u7b97\u597d，\u800c\u5e94\u8be5\u5728\u88ab\u9700\u8981\u7684\u90a3\u4e00\u523b\u624d\u7b97\u51fa\u6765\u3002\u8fd9\u5c31\u662f"\u60f0\u6027\u6c42\u503c（lazy evaluation）\u201c\u3002\u8fed\u4ee3\u5668\u5c31\u662f\u627f\u8f7d\u60f0\u6027\u6c42\u503c\u7684\u5bf9\u8c61\u2014\u2014\u5b83\u50cf\u4e00\u4e2a"\u6e38\u6807\u201d，\u4f60\u6bcf\u53eb\u4e00\u6b21 next()，\u5b83\u624d\u5f80\u524d\u8d70\u4e00\u6b65\u3001\u5410\u51fa\u4e00\u4e2a\u503c\u3002<\/p>\n
\n
\u4e8c\u3001Iterator \u63a5\u53e3：\u4e00\u4e2a next() \u65b9\u6cd5\u7684\u534f\u8bae<\/h3>\n
\u4ed3\u9889\u6807\u51c6\u5e93\u4e2d，\u8fed\u4ee3\u5668\u7684\u5b9a\u4e49\u6781\u5176\u7b80\u5355（std.core \u5305，\u65e0\u9700 import）：<\/p>\n
public interface Iterator<T> {
\n func next(): Option<T>
\n}<\/p>\n
\u5c31\u4e00\u4e2a\u65b9\u6cd5：<\/p>\n
- \n
- \u8fd4\u56de Some(\u503c)：\u6e38\u6807\u5f53\u524d\u4f4d\u7f6e\u6709\u503c，\u540c\u65f6\u6e38\u6807\u524d\u8fdb\u4e00\u6b65；<\/li>\n
- \u8fd4\u56de None：\u5e8f\u5217\u5230\u5934\u4e86，\u4ee5\u540e\u518d\u8c03\u4e5f\u6c38\u8fdc\u662f None\u3002<\/li>\n<\/ul>\n
\u81ea\u5df1\u5199\u4e00\u4e2a\u8fed\u4ee3\u5668，\u53ea\u8981\u5b9e\u73b0\u8fd9\u4e2a\u63a5\u53e3\u3002\u6ce8\u610f\u4ed3\u9889\u7684\u8bed\u6cd5：\u63a5\u53e3\u5b9e\u73b0\u7528 <:，\u63a5\u53e3\u65b9\u6cd5\u5728\u5b9e\u73b0\u7c7b\u91cc\u8981\u52a0 public：<\/p>\n
class Counter <: Iterator<Int64> {
\n var current: Int64 = 1
\n let limit: Int64<\/p>\ninit(limit: Int64) {
\n this.limit = limit
\n }<\/p>\npublic func next(): Option<Int64> {
\n if (current <= limit) {
\n let v = current
\n current++
\n return Some(v)
\n }
\n return None
\n }
\n}<\/p>\n🚫 \u4ed3\u9889\u7684\u7c7b\u6ca1\u6709\u4e3b\u6784\u9020\u51fd\u6570\u7b80\u5199\u3002\u5199 class Counter(var current: Int64, let limit: Int64)（Kotlin \u98ce\u683c）\u4f1a\u76f4\u63a5\u62a5 expected '{', found '('\u3002\u5fc5\u987b\u5148\u5728\u7c7b\u4f53\u91cc\u58f0\u660e\u5b57\u6bb5，\u518d\u5199 init \u6784\u9020\u51fd\u6570\u3002\u7b2c 15 \u8bfe\u4f1a\u4e13\u95e8\u8bb2，\u8fd9\u91cc\u5148\u7167\u6284\u683c\u5f0f\u3002<\/p>\n
\n\u4e09\u3001\u6d88\u8d39\u8fed\u4ee3\u5668\u7684\u4e09\u79cd\u59ff\u52bf<\/h3>\n
3.1 \u624b\u52a8\u8c03 next()：while + match<\/h4>\n
\u8fed\u4ee3\u5668\u6700\u539f\u59cb\u7684\u6d88\u8d39\u65b9\u5f0f\u3002\u4ed3\u9889 1.1.3 \u6ca1\u6709 while let Some(v) = … \u8fd9\u7c7b\u8bed\u6cd5\u7cd6，\u6807\u51c6\u5199\u6cd5\u662f while (true) \u914d\u5408\u7b2c 4\u30019 \u8bfe\u7684 match：<\/p>\n
main(): Int64 {
\n let c = Counter(3)
\n while (true) {
\n match (c.next()) {
\n case Some(v) => print("${v} ")
\n case None => break
\n }
\n }
\n println()
\n return 0
\n}<\/p>\n\u8f93\u51fa：<\/p>\n
1 2 3<\/p>\n
None \u4e00\u51fa\u73b0\u5c31 break，\u6e38\u6807\u5230\u6b64\u8017\u5c3d\u3002<\/p>\n
3.2 for-in：\u6700\u5e38\u7528<\/h4>\n
\u5b9e\u73b0\u4e86 Iterator \u7684\u5bf9\u8c61\u53ef\u4ee5\u76f4\u63a5\u653e\u8fdb for-in，\u7f16\u8bd1\u5668\u5e2e\u4f60\u91cd\u590d\u8c03 next() \u5e76\u5728 None \u65f6\u505c\u6b62：<\/p>\n
for (v in Counter(5)) {
\n print("${v} ")
\n}<\/p>\n1 2 3 4 5<\/p>\n
3.3 \u7ec8\u7aef\u65b9\u6cd5：\u51fd\u6570\u5f0f\u4e00\u628a\u68ad<\/h4>\n
\u8fed\u4ee3\u5668\u4e0a\u6302\u4e86\u5341\u51e0\u4e2a\u73b0\u6210\u65b9\u6cd5（\u7b2c\u516d\u8282\u7ec6\u8bb2），forEach \u662f\u5176\u4e2d\u6700\u76f4\u63a5\u7684\u2014\u2014\u5bf9\u6bcf\u4e2a\u503c\u6267\u884c\u4e00\u4e2a Lambda：<\/p>\n
Counter(3).forEach { v => print("${v} ") }<\/p>\n
\n\u56db\u3001Iterable \u63a5\u53e3：\u8ba9\u81ea\u5b9a\u4e49\u5bb9\u5668\u652f\u6301 for-in<\/h3>\n
Counter \u90a3\u79cd"\u81ea\u5df1\u5c31\u662f\u6e38\u6807"\u7684\u5bf9\u8c61\u9002\u5408\u4e00\u6b21\u6027\u904d\u5386\u3002\u4f46\u66f4\u591a\u65f6\u5019\u6211\u4eec\u6709\u7684\u662f\u5bb9\u5668（\u4e66\u67b6\u3001\u6210\u7ee9\u8868\u3001\u4f20\u611f\u5668\u4e00\u5468\u7684\u6570\u636e）\u2014\u2014\u5bb9\u5668\u5e0c\u671b\u80fd\u88ab\u53cd\u590d\u904d\u5386，\u6bcf\u6b21\u904d\u5386\u90fd\u4ece\u5934\u5f00\u59cb\u3002<\/p>\n
\u8fd9\u65f6\u7528\u53e6\u4e00\u4e2a\u63a5\u53e3 Iterable<T>，\u5b83\u540c\u6837\u53ea\u6709\u4e00\u4e2a\u65b9\u6cd5：<\/p>\n
public interface Iterable<T> {
\n func iterator(): Iterator<T>
\n}<\/p>\n\u6ce8\u610f\u5b83\u7684\u65b9\u6cd5\u7b7e\u540d：\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\u3002\u8fd9\u662f\u4e00\u4e2a"\u5de5\u5382\u65b9\u6cd5"\u2014\u2014\u6bcf\u8c03\u7528\u4e00\u6b21，\u5c31\u751f\u4ea7\u51fa\u4e00\u4e2a\u6e38\u6807\u5728\u8d77\u70b9\u7684\u5168\u65b0\u8fed\u4ee3\u5668\u3002<\/p>\n
\u5b8c\u6574\u5957\u8def\u662f"\u5bb9\u5668 + \u4e13\u5c5e\u6e38\u6807\u7c7b"\u4e24\u4ef6\u5957：<\/p>\n
\/\/ \u6e38\u6807：\u6301\u6709\u5bb9\u5668\u5f15\u7528\u548c\u5f53\u524d\u4e0b\u6807
\nclass RangeIter <: Iterator<Int64> {
\n var current: Int64
\n let end: Int64<\/p>\ninit(start: Int64, end: Int64) {
\n this.current = start
\n this.end = end
\n }<\/p>\npublic func next(): Option<Int64> {
\n if (current <= end) {
\n let v = current
\n current++
\n return Some(v)
\n }
\n return None
\n }
\n}<\/p>\n\/\/ \u5bb9\u5668：\u6bcf\u6b21\u88ab\u904d\u5386\u90fd new \u4e00\u4e2a\u65b0\u6e38\u6807
\nclass IntRange <: Iterable<Int64> {
\n let start: Int64
\n let end: Int64<\/p>\ninit(start: Int64, end: Int64) {
\n this.start = start
\n this.end = end
\n }<\/p>\npublic func iterator(): Iterator<Int64> {
\n return RangeIter(start, end)
\n }
\n}<\/p>\nmain(): Int64 {
\n for (v in IntRange(1, 5)) {
\n print("${v} ")
\n }
\n println()
\n return 0
\n}<\/p>\n1 2 3 4 5<\/p>\n
\u6807\u51c6\u5e93\u7684 Array\u3001ArrayList\u3001Range\u3001HashMap（\u904d\u5386\u952e\u503c\u5bf9）\u8d70\u7684\u90fd\u662f\u8fd9\u5957\u534f\u8bae\u3002\u7b2c 6 \u8bfe\u5b66\u7684\u5b57\u7b26\u4e32\u5b57\u8282\u904d\u5386\u548c runes() \u5b57\u7b26\u904d\u5386，\u672c\u8d28\u4e5f\u662f\u8fed\u4ee3\u5668\u3002<\/p>\n
🚫 \u5982\u679c\u4e00\u4e2a\u7c7b\u5149\u5199\u4e86 iterator() \u65b9\u6cd5\u5374\u4e0d\u58f0\u660e <: Iterable<T>，for-in \u4f1a\u62a5\u9519：the type … does not implement Iterator\u3002\u4ed3\u9889\u4e0d\u770b"\u65b9\u6cd5\u957f\u5f97\u50cf\u4e0d\u50cf"，\u53ea\u8ba4\u63a5\u53e3\u58f0\u660e\u3002<\/p>\n
\n\u4e94\u3001Iterator \u4e0e Iterable：\u4e00\u6b21\u6027\u6e38\u6807 vs \u53ef\u91cd\u590d\u904d\u5386<\/h3>\n
\u8fd9\u662f\u672c\u8282\u8bfe\u6700\u5bb9\u6613\u6df7\u6dc6\u3001\u4e5f\u6700\u5173\u952e\u7684\u4e00\u70b9\u3002\u4e24\u4e2a\u63a5\u53e3\u662f\u5e76\u5217\u5173\u7cfb，\u4e0d\u662f\u7ee7\u627f（\u6211\u8bd5\u8fc7\u628a Iterable \u5bf9\u8c61\u8d4b\u7ed9 Iterator \u53d8\u91cf，\u7f16\u8bd1\u5668\u76f4\u63a5 mismatched types）\u3002\u5206\u5de5\u5982\u4e0b：<\/p>\n
\n
Iterator<T>Iterable<T><\/tr>\n \n\n \u89d2\u8272<\/td>\n \u6e38\u6807（\u6709\u72b6\u6001\u3001\u4f1a\u524d\u8fdb）<\/td>\n \u5bb9\u5668（\u6570\u636e\u672c\u8eab）<\/td>\n<\/tr>\n \n \u8981\u5b9e\u73b0\u7684\u65b9\u6cd5<\/td>\n next(): Option<T><\/td>\n iterator(): Iterator<T><\/td>\n<\/tr>\n \n \u80fd\u5426\u91cd\u590d\u904d\u5386<\/td>\n \u4e0d\u80fd，\u8017\u5c3d\u5373\u7a7a<\/td>\n \u80fd，\u6bcf\u6b21\u4ea7\u751f\u65b0\u6e38\u6807<\/td>\n<\/tr>\n \n \u5178\u578b\u4ee3\u8868<\/td>\n arr.iterator() \u7684\u8fd4\u56de\u503c<\/td>\n \u6570\u7ec4\u3001ArrayList\u3001Range<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u5b9e\u6d4b"\u8fed\u4ee3\u5668\u4e00\u6b21\u6027"：<\/p>\n
main(): Int64 {
\n let arr = [10, 20, 30]<\/p>\nlet it = arr.iterator()
\n let n1 = it.fold(0) { acc, _ => acc + 1 }
\n let n2 = it.fold(0) { acc, _ => acc + 1 }
\n println("\u7b2c\u4e00\u6b21：${n1}，\u7b2c\u4e8c\u6b21：${n2}")<\/p>\n\/\/ \u76f4\u63a5\u904d\u5386\u6570\u7ec4（Iterable），\u591a\u5c11\u6b21\u90fd\u884c
\n let n3 = arr.iterator().fold(0) { acc, _ => acc + 1 }
\n println("\u91cd\u65b0\u62ff\u4e00\u4e2a\u6e38\u6807：${n3}")
\n return 0
\n}<\/p>\n\u7b2c\u4e00\u6b21：3，\u7b2c\u4e8c\u6b21：0
\n\u91cd\u65b0\u62ff\u4e00\u4e2a\u6e38\u6807：3<\/p>\n\u540c\u4e00\u4e2a it \u904d\u5386\u4e00\u904d\u540e\u6e38\u6807\u5df2\u5230\u5c3d\u5934，\u7b2c\u4e8c\u904d\u4ec0\u4e48\u90fd\u6ca1\u6709（0 \u4e2a）；\u800c\u5411\u6570\u7ec4（Iterable）\u518d\u8981\u4e00\u4e2a iterator()，\u53c8\u662f\u4e00\u6761\u597d\u6c49\u3002<\/p>\n
📌 \u7ecf\u9a8c\u6cd5\u5219：\u81ea\u5df1\u5199\u6570\u636e\u5bb9\u5668，\u5b9e\u73b0 Iterable；\u53ea\u60f3\u751f\u6210\u4e00\u4e32\u503c（\u5c24\u5176\u662f\u7b97\u51fa\u6765\u7684\u3001\u65e0\u9650\u7684），\u5b9e\u73b0 Iterator\u3002<\/p>\n
\n\u516d\u3001\u60f0\u6027\u6d41\u6c34\u7ebf：map \/ filter \/ take \/ skip<\/h3>\n
\u8fed\u4ee3\u5668\u4e4b\u6240\u4ee5\u597d\u7528，\u662f\u56e0\u4e3a Iterator \u4e0a\u6302\u4e86\u4e00\u4e32\u94fe\u5f0f\u65b9\u6cd5，\u5199\u6cd5\u548c\u7b2c 12 \u8bfe\u7684\u6570\u7ec4 Lambda \u51e0\u4e4e\u4e00\u6837，\u4f46\u8bed\u4e49\u5b8c\u5168\u4e0d\u540c：<\/p>\n
6.1 \u5148\u770b\u6570\u7ec4\u4e0a\u7684\u94fe：\u7acb\u5373\u6c42\u503c<\/h4>\n
let nums = [1, 2, 3, 4, 5, 6, 7, 8]
\nlet r = nums.map { x => x * 2 }.filter { x => x > 10 }.take(2)
\nprintln("${r}")<\/p>\n[12, 14]<\/p>\n
\u8fd9\u6761\u94fe\u6bcf\u4e00\u6b65\u90fd\u7acb\u523b\u6267\u884c\u5e76\u4ea7\u51fa\u4e00\u4e2a\u65b0\u6570\u7ec4：map \u5148\u9020\u4e00\u4e2a 8 \u5143\u7d20\u6570\u7ec4，filter \u518d\u9020\u4e00\u4e2a，take \u518d\u9020\u4e00\u4e2a\u3002\u6570\u636e\u91cf\u5927\u65f6\u4e2d\u95f4\u6570\u7ec4\u4f1a\u6d6a\u8d39\u5927\u91cf\u5185\u5b58\u3002<\/p>\n
6.2 \u518d\u770b\u8fed\u4ee3\u5668\u4e0a\u7684\u94fe：\u60f0\u6027\u6c42\u503c<\/h4>\n
\u53ea\u8981\u5728\u5f00\u5934\u52a0\u4e00\u4e2a .iterator()，\u6574\u6761\u94fe\u7684\u6027\u8d28\u5c31\u53d8\u4e86：<\/p>\n
let r2 = nums.iterator()
\n .map { x => x * 2 }
\n .filter { x => x > 10 }
\n .take(2)
\n .forEach { v => print("${v} ") }<\/p>\n- \n
- map \/ filter \/ take \/ skip \u79f0\u4e3a\u4e2d\u95f4\u64cd\u4f5c：\u5b83\u4eec\u4e0d\u7acb\u523b\u8ba1\u7b97，\u53ea\u662f\u8fd4\u56de\u4e00\u4e2a"\u8bb0\u4f4f\u4e86\u89c4\u5219"\u7684\u65b0\u8fed\u4ee3\u5668，\u50cf\u4e00\u4e32\u6263\u5728\u4e00\u8d77\u7684\u9f7f\u8f6e；<\/li>\n
- forEach \/ fold \/ any \u7b49\u79f0\u4e3a\u7ec8\u7aef\u64cd\u4f5c：\u53ea\u6709\u8c03\u7528\u5b83\u4eec，\u9f7f\u8f6e\u624d\u771f\u6b63\u8f6c\u52a8，\u5f00\u59cb\u4e00\u4e2a\u4e00\u4e2a\u5730 next() \u62c9\u53d6；<\/li>\n
- take(2) \u62c9\u591f 2 \u4e2a\u5c31\u505c\u2014\u2014\u4e0a\u6e38\u4e0d\u4f1a\u591a\u7b97\u4e00\u4e2a\u503c\u3002<\/li>\n<\/ul>\n
\u7a7a\u53e3\u65e0\u51ed，\u770b\u5b9e\u6d4b\u3002\u5728 map \u91cc\u585e\u4e00\u884c\u6253\u5370\u5f53"\u63a2\u9488"，\u53ea\u53d6 3 \u4e2a\u503c：<\/p>\n
main(): Int64 {
\n let data = [10, 20, 30, 40, 50]
\n let lazyMapped = data.iterator().map { x =>
\n println(" …\u6b63\u5728\u8ba1\u7b97 ${x}")
\n x * 2
\n }
\n println("\u53ea\u53d6\u524d 3 \u4e2a：")
\n lazyMapped.take(3).forEach { v => println("\u5f97\u5230 ${v}") }
\n return 0
\n}<\/p>\n\u53ea\u53d6\u524d 3 \u4e2a：
\n …\u6b63\u5728\u8ba1\u7b97 10
\n\u5f97\u5230 20
\n …\u6b63\u5728\u8ba1\u7b97 20
\n\u5f97\u5230 40
\n …\u6b63\u5728\u8ba1\u7b97 30
\n\u5f97\u5230 60<\/p>\n5 \u4e2a\u6570\u636e，\u53ea\u7b97\u4e86\u524d 3 \u4e2a\u2014\u201440 \u548c 50 \u7684 map \u89c4\u5219\u4e00\u6b21\u90fd\u6ca1\u6267\u884c\u3002\u8fd9\u5c31\u662f\u60f0\u6027：\u7ec8\u7aef\u64cd\u4f5c\u8981\u591a\u5c11，\u4e2d\u95f4\u64cd\u4f5c\u624d\u7b97\u591a\u5c11\u3002\u5982\u679c\u8fd9\u662f 10 GB \u65e5\u5fd7，\u7701\u4e0b\u7684\u5c31\u662f\u5de8\u91cf\u5185\u5b58\u548c\u65f6\u95f4\u3002<\/p>\n
6.3 \u5e38\u7528\u4e2d\u95f4\u64cd\u4f5c<\/h4>\n
\n
\u65b9\u6cd5\u4f5c\u7528<\/tr>\n \n\n map { x => … }<\/td>\n \u9010\u4e2a\u53d8\u6362\u503c\u7684\u7c7b\u578b\/\u5185\u5bb9<\/td>\n<\/tr>\n \n filter { x => \u6761\u4ef6 }<\/td>\n \u53ea\u4fdd\u7559\u6ee1\u8db3\u6761\u4ef6\u7684\u503c<\/td>\n<\/tr>\n \n take(n)<\/td>\n \u53ea\u53d6\u524d n \u4e2a，\u7136\u540e\u7ed3\u675f<\/td>\n<\/tr>\n \n skip(n)<\/td>\n \u8df3\u8fc7\u524d n \u4e2a，\u4ece\u7b2c n+1 \u4e2a\u5f00\u59cb<\/td>\n<\/tr>\n \n flatMap { x => \u8fed\u4ee3\u5668 }<\/td>\n \u4e00\u5bf9\u591a\u5c55\u5f00，\u518d\u62cd\u5e73\u6210\u4e00\u6761\u6d41<\/td>\n<\/tr>\n \n zip(\u53e6\u4e00\u4e2a\u8fed\u4ee3\u5668)<\/td>\n \u4e24\u6761\u6d41\u914d\u5bf9，\u4ea7\u51fa (a, b) \u5143\u7ec4，\u77ed\u7684\u5230\u5934\u5c31\u7ed3\u675f<\/td>\n<\/tr>\n \n concat(\u53e6\u4e00\u4e2a\u8fed\u4ee3\u5668)<\/td>\n \u5148\u6d41\u5b8c\u81ea\u5df1，\u518d\u63a5\u4e0a\u6d41\u53e6\u4e00\u4e2a<\/td>\n<\/tr>\n \n enumerate()<\/td>\n \u7ed9\u6bcf\u4e2a\u503c\u8d34\u4e0a\u4ece 0 \u5f00\u59cb\u7684\u7f16\u53f7，\u4ea7\u51fa (\u4e0b\u6807, \u503c) \u5143\u7ec4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n flatMap \u793a\u4f8b（\u6bcf\u4e2a\u503c\u5c55\u5f00\u6210\u4e24\u4e2a）：<\/p>\n
[1, 2, 3].iterator()
\n .flatMap { x => [x, x * 10].iterator() }
\n .forEach { v => print("${v} ") }<\/p>\n1 10 2 20 3 30<\/p>\n
\u26a0\ufe0f \u5143\u7ec4\u4e0d\u80fd\u76f4\u63a5\u5b57\u7b26\u4e32\u63d2\u503c\u3002zip \/ enumerate \u4ea7\u51fa\u7684\u5143\u7ec4\u5199 "${p}" \u4f1a\u62a5 Tuple … should implement interface 'ToString'，\u8981\u7528\u4e0b\u6807\u53d6\u5206\u91cf：p[0]\u3001p[1]\u3002<\/p>\n
\n\u4e03\u3001\u65e0\u9650\u5e8f\u5217：\u6709\u4e86 take，\u65e0\u7a77\u4e5f\u6562\u904d\u5386<\/h3>\n
\u60f0\u6027\u8fed\u4ee3\u5668\u6700\u9707\u64bc\u7684\u7528\u6cd5：\u5e8f\u5217\u53ef\u4ee5\u662f\u65e0\u9650\u7684\u3002\u56e0\u4e3a\u53cd\u6b63\u4f60\u4e0d\u4e3b\u52a8\u62c9，\u5b83\u4e00\u4e2a\u503c\u90fd\u4e0d\u4f1a\u7b97；\u518d\u914d\u5408 take \u8bbe\u597d"\u5b89\u5168\u9600"，\u65e0\u9650\u6d41\u5c31\u53d8\u6210\u4e86"\u60f3\u8981\u591a\u5c11\u53d6\u591a\u5c11"\u3002<\/p>\n
\u5b9e\u6d4b\u4e00\u4e2a\u65e0\u9650\u7684\u6590\u6ce2\u90a3\u5951\u6570\u5217\u751f\u6210\u5668：<\/p>\n
class Fib <: Iterator<Int64> {
\n var a: Int64 = 0
\n var b: Int64 = 1<\/p>\npublic func next(): Option<Int64> {
\n let v = a
\n a = b
\n b = v + b
\n return Some(v) \/\/ \u6c38\u8fdc\u8fd4\u56de Some，\u5e8f\u5217\u6ca1\u6709\u5c3d\u5934
\n }
\n}<\/p>\nmain(): Int64 {
\n print("\u524d 10 \u4e2a\u6590\u6ce2\u90a3\u5951\u6570：")
\n Fib().take(10).forEach { x => print("${x} ") }
\n println()
\n return 0
\n}<\/p>\n\u524d 10 \u4e2a\u6590\u6ce2\u90a3\u5951\u6570：0 1 1 2 3 5 8 13 21 34<\/p>\n
Fib() \u672c\u8eab\u662f\u65e0\u9650\u7684，\u76f4\u63a5 for (v in Fib()) \u4f1a\u6b7b\u5faa\u73af；\u4f46 take(10) \u62c9\u6ee1 10 \u4e2a\u5c31\u53d1\u51fa\u7ed3\u675f\u4fe1\u53f7，\u7a0b\u5e8f\u5b89\u7136\u65e0\u6059\u3002\u81ea\u7136\u6570\u3001\u7d20\u6570\u6d41\u3001\u968f\u673a\u6570\u6d41\u90fd\u662f\u540c\u4e00\u4e2a\u5957\u8def\u3002<\/p>\n
🚫 \u4ed3\u9889 1.1.3 \u6ca1\u6709\u751f\u6210\u5668\u8bed\u6cd5\u7cd6\u3002 \u7f51\u4e0a\u770b\u5230\u4ed3\u9889（\u6216\u5176\u4ed6\u8bed\u8a00）\u6559\u7a0b\u91cc\u5199 sequence<Int64> { yield(1); yield(2) }\u3001\u6216\u5728\u666e\u901a\u51fd\u6570\u91cc\u5199 yield(x) \u5f53\u751f\u6210\u5668\u2014\u2014\u672c\u7248\u672c\u7f16\u8bd1\u5668\u4f1a\u62a5 undeclared identifier 'sequence' \/ undeclared identifier 'yield'\u3002\u4ed3\u9889\u7684\u505a\u6cd5\u5c31\u662f\u8001\u8001\u5b9e\u5b9e\u5199\u4e00\u4e2a\u5b9e\u73b0 Iterator \u7684\u7c7b，\u628a"\u72b6\u6001"\u653e\u8fdb\u5b57\u6bb5（\u6bd4\u5982 Fib \u7684 a\u3001b），\u5728 next() \u91cc\u63a8\u8fdb\u72b6\u6001\u3002\u5570\u55e6\u4e00\u70b9，\u4f46\u903b\u8f91\u5b8c\u5168\u900f\u660e\u3002<\/p>\n
\n\u516b\u3001\u7ec8\u7aef\u64cd\u4f5c\u4e0e API \u901f\u67e5<\/h3>\n
\u7ec8\u7aef\u64cd\u4f5c\u4e00\u8c03\u7528，\u6574\u6761\u60f0\u6027\u94fe\u5f00\u59cb\u771f\u6b63\u8fd0\u7b97，\u5e76\u7ed9\u51fa\u4e00\u4e2a\u6700\u7ec8\u7ed3\u679c（\u800c\u4e0d\u662f\u53e6\u4e00\u4e2a\u8fed\u4ee3\u5668）\u3002\u5747\u5728 1.1.3 \u5b9e\u6d4b：<\/p>\n
\n
\u65b9\u6cd5\u8fd4\u56de\u8bf4\u660e<\/tr>\n \n\n forEach { x => … }<\/td>\n Unit<\/td>\n \u9010\u503c\u6267\u884c\u526f\u4f5c\u7528（\u6253\u5370\u3001\u5199\u5165\u6587\u4ef6\u7b49）<\/td>\n<\/tr>\n \n fold(\u521d\u503c) { acc, x => … }<\/td>\n \u7d2f\u52a0\u7ed3\u679c<\/td>\n \u6700\u901a\u7528\u7684\u805a\u5408，\u6c42\u548c\/\u8ba1\u6570\/\u62fc\u63a5\u90fd\u9760\u5b83<\/td>\n<\/tr>\n \n reduce { a, b => … }<\/td>\n Option<R><\/td>\n \u65e0\u521d\u503c\u805a\u5408，\u7a7a\u6d41\u8fd4\u56de None，\u66f4\u5b89\u5168<\/td>\n<\/tr>\n \n count()<\/td>\n Int64<\/td>\n \u7edf\u8ba1\u5269\u4f59\u5143\u7d20\u4e2a\u6570（\u4e0d\u63a5\u53d7\u6761\u4ef6，\u8981\u6761\u4ef6\u8ba1\u6570\u5148 filter）<\/td>\n<\/tr>\n \n any { x => \u6761\u4ef6 }<\/td>\n Bool<\/td>\n \u662f\u5426\u5b58\u5728\u6ee1\u8db3\u6761\u4ef6\u7684\u503c（\u627e\u5230\u5373\u505c）<\/td>\n<\/tr>\n \n all { x => \u6761\u4ef6 }<\/td>\n Bool<\/td>\n \u662f\u5426\u5168\u90e8\u6ee1\u8db3（\u9047\u5230\u53cd\u4f8b\u5373\u505c）<\/td>\n<\/tr>\n \n first()<\/td>\n Option<T><\/td>\n \u7b2c\u4e00\u4e2a\u503c，\u7a7a\u6d41\u4e3a None<\/td>\n<\/tr>\n \n min() \/ max()<\/td>\n Option<T><\/td>\n \u6700\u5c0f\/\u6700\u5927\u503c，\u7a7a\u6d41\u4e3a None<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u51e0\u4e2a\u5b9e\u6d4b\u8981\u70b9：<\/p>\n
\u2460 \u6761\u4ef6\u8ba1\u6570\u7528 filter(…).count()，\u56e0\u4e3a count() \u4e0d\u5e26\u53c2\u6570：<\/p>\n
let n = [1, 2, 3, 4].iterator().filter { x => x > 2 }.count()
\nprintln("${n}") \/\/ 2<\/p>\n\u2461 reduce \/ min \/ max \/ first \u8fd4\u56de Option，\u7a7a\u6d41\u4e0d\u629b\u5f02\u5e38，\u7528 match \u6216 ?? \u515c\u5e95：<\/p>\n
match (ArrayList<Int64>().iterator().min()) {
\n case Some(v) => println("\u6700\u5c0f\u503c ${v}")
\n case None => println("\u7a7a\u7684，\u6ca1\u6709\u6700\u5c0f\u503c")
\n}<\/p>\n\u7a7a\u7684，\u6ca1\u6709\u6700\u5c0f\u503c<\/p>\n
\u2462 \u8fed\u4ee3\u5668\u4e0a\u6ca1\u6709 toArray() \/ toArrayList()，\u60f3\u628a\u60f0\u6027\u94fe\u7684\u7ed3\u679c\u6536\u6210\u96c6\u5408，\u624b\u52a8\u63a5\u8fdb ArrayList（forEach \u91cc\u8c03\u7528\u7684\u662f\u5bb9\u5668\u65b9\u6cd5，\u4e0d\u6355\u83b7\u5916\u5c42 var，\u5408\u6cd5）：<\/p>\n
let list = ArrayList<Int64>()
\nFib().take(5).forEach { x => list.add(x) }
\nlet arr = list.toArray()
\nprintln("${arr}") \/\/ [0, 1, 1, 2, 3]<\/p>\n\u2463 \u4e00\u5f20"\u522b\u5199\u9519\u540d\u5b57"\u5bf9\u7167\u8868（\u5de6\u5217\u5728 1.1.3 \u8fed\u4ee3\u5668\u4e0a\u4e0d\u5b58\u5728，\u53f3\u5217\u624d\u662f\u5bf9\u7684）：<\/p>\n
\n
\u522b\u5199\u6b63\u786e\u5199\u6cd5<\/tr>\n \n\n iter.drop(n)<\/td>\n iter.skip(n)<\/td>\n<\/tr>\n \n iter1.chain(iter2)<\/td>\n iter1.concat(iter2)<\/td>\n<\/tr>\n \n iter.sum()<\/td>\n iter.fold(0) { a, b => a + b }<\/td>\n<\/tr>\n \n iter.toArray()<\/td>\n forEach \u624b\u52a8\u6536\u96c6\u8fdb ArrayList，\u518d toArray()<\/td>\n<\/tr>\n \n iter.count { x => … }<\/td>\n iter.filter { x => … }.count()<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\u4e5d\u3001CIDE \u5b9e\u64cd：\u6c14\u6e29\u76d1\u6d4b\u6570\u636e\u6d41<\/h3>\n
9.1 \u7f16\u5199\u7a0b\u5e8f<\/h4>\n
\u7efc\u5408\u8fd0\u7528\u672c\u8282\u8bfe\u5168\u90e8\u8981\u7d20：\u81ea\u5b9a\u4e49\u65e0\u9650\u8fed\u4ee3\u5668 + \u81ea\u5b9a\u4e49 Iterable \u5bb9\u5668\u3001\u60f0\u6027 filter\/map\/take\u3001fold\/reduce \u805a\u5408\u3001any\/all \u5224\u5b9a\u3001min\/max \u5b89\u5168\u53d6\u503c\u3001enumerate \u7f16\u53f7\u3001concat \u62fc\u63a5\u3002<\/p>\n
\u573a\u666f：\u6c14\u8c61\u7ad9\u4e00\u5468\u6c14\u6e29\u8bfb\u6570，\u7528 -99 \u6807\u8bb0\u4f20\u611f\u5668\u7f3a\u5931\u7684\u6570\u636e\u3002\u9700\u8981\u8fc7\u6ee4\u7f3a\u5931\u503c\u5e76\u5b8c\u6210\u7edf\u8ba1；\u53e6\u7528\u4e00\u4e2a\u65e0\u9650\u81ea\u7136\u6570\u6d41\u6f14\u793a"\u65e0\u9650\u6570\u636e + take \u5b89\u5168\u9600"\u3002<\/p>\n
package WeatherIter<\/p>\n
import std.collection.*<\/p>\n
\/\/ \u2460 \u65e0\u9650\u8fed\u4ee3\u5668：\u4ece 1 \u5f00\u59cb\u7684\u81ea\u7136\u6570\u6d41
\nclass Naturals <: Iterator<Int64> {
\n var n: Int64 = 1
\n public func next(): Option<Int64> {
\n let v = n
\n n++
\n return Some(v)
\n }
\n}<\/p>\n\/\/ \u2461 \u5bb9\u5668：\u4e00\u5468\u6c14\u6e29\u8bfb\u6570
\nclass WeeklyTemps <: Iterable<Int64> {
\n let data: Array<Int64>
\n init(data: Array<Int64>) { this.data = data }
\n public func iterator(): Iterator<Int64> {
\n return TempIter(data)
\n }
\n}<\/p>\n\/\/ \u5bb9\u5668\u4e13\u5c5e\u6e38\u6807
\nclass TempIter <: Iterator<Int64> {
\n let data: Array<Int64>
\n var i: Int64 = 0
\n init(data: Array<Int64>) { this.data = data }
\n public func next(): Option<Int64> {
\n if (i < data.size) {
\n let v = data[i]
\n i++
\n return Some(v)
\n }
\n return None
\n }
\n}<\/p>\nmain(): Int64 {
\n \/\/ \u2014\u2014 \u65e0\u9650\u6d41\u4e5f\u6562\u7528，take \u515c\u5e95 \u2014\u2014
\n print("\u524d 10 \u4e2a\u5e73\u65b9\u6570：")
\n Naturals().map { x => x * x }.take(10).forEach { v => print("${v} ") }
\n println()<\/p>\n\/\/ \u2014\u2014 \u771f\u5b9e\u5bb9\u5668\u7684\u60f0\u6027\u6d41\u6c34\u7ebf \u2014\u2014
\n let week = WeeklyTemps([21, -99, 23, -99, 25, 22, 30])<\/p>\n\/\/ \u4e2a\u6570\u4e0e\u603b\u548c（count \u4e0d\u63a5\u53d7\u6761\u4ef6，\u5148 filter）
\n let count = week.iterator().filter { t => t != -99 }.count()
\n let total = week.iterator().filter { t => t != -99 }.fold(0) { a, b => a + b }
\n println("\u6709\u6548\u5929\u6570：${count}，\u5e73\u5747\u6c14\u6e29：${total \/ count}\u2103")<\/p>\n\/\/ reduce \u65e0\u521d\u503c\u6c42\u548c：\u7a7a\u6d41\u5929\u7136\u5f97\u5230 None
\n let valid = week.iterator().filter { t => t != -99 }
\n match (valid.reduce { a, b => a + b }) {
\n case Some(s) => println("reduce \u603b\u548c：${s}")
\n case None => println("\u6ca1\u6709\u6709\u6548\u8bfb\u6570")
\n }<\/p>\n\/\/ \u5224\u5b9a\u7c7b\u7ec8\u7aef\u64cd\u4f5c
\n println("\u662f\u5426\u5168\u90e8\u9ad8\u4e8e 20\u2103：${week.iterator().filter { t => t != -99 }.all { t => t > 20 }}")
\n println("\u662f\u5426\u51fa\u73b0\u8fc7 30\u2103：${week.iterator().any { t => t == 30 }}")<\/p>\n\/\/ \u6700\u9ad8\u6e29：max() \u8fd4\u56de Option，\u7528 ?? \u515c\u5e95
\n println("\u6700\u9ad8\u6e29：${week.iterator().filter { t => t != -99 }.max() ?? -1}\u2103")<\/p>\n\/\/ \u5e26\u7f16\u53f7\u5c55\u793a\u524d 3 \u4e2a\u6709\u6548\u8bfb\u6570（\u5143\u7ec4\u7528 p[0]\/p[1] \u53d6\u503c）
\n print("\u524d 3 \u4e2a\u6709\u6548\u8bfb\u6570：")
\n week.iterator().filter { t => t != -99 }.take(3).enumerate().forEach { p =>
\n print("\u7b2c${p[0] + 1}\u5929=${p[1]}\u2103 ")
\n }
\n println()<\/p>\n\/\/ concat \u62fc\u63a5\u4e24\u5468\u6570\u636e
\n let week2 = WeeklyTemps([19, 20])
\n print("\u4e24\u5468\u8fde\u8bfb\u524d 4 \u4e2a：")
\n week.iterator().concat(week2.iterator()).take(4).forEach { v => print("${v} ") }
\n println()<\/p>\nreturn 0
\n}<\/p>\n9.2 \u8fd0\u884c\u4e0e\u9a8c\u8bc1<\/h4>\n
\u524d 10 \u4e2a\u5e73\u65b9\u6570：1 4 9 16 25 36 49 64 81 100
\n\u6709\u6548\u5929\u6570：5，\u5e73\u5747\u6c14\u6e29：24\u2103
\nreduce \u603b\u548c：121
\n\u662f\u5426\u5168\u90e8\u9ad8\u4e8e 20\u2103：true
\n\u662f\u5426\u51fa\u73b0\u8fc7 30\u2103：true
\n\u6700\u9ad8\u6e29：30\u2103
\n\u524d 3 \u4e2a\u6709\u6548\u8bfb\u6570：\u7b2c1\u5929=21\u2103 \u7b2c2\u5929=23\u2103 \u7b2c3\u5929=25\u2103
\n\u4e24\u5468\u8fde\u8bfb\u524d 4 \u4e2a：21 -99 23 -99<\/p>\n\u5173\u952e\u70b9\u89e3\u8bfb：<\/p>\n
- \n
- Naturals \u6c38\u8fdc\u8fd4\u56de Some，\u662f\u771f\u6b63\u7684\u65e0\u9650\u6d41；take(10) \u50cf\u95f8\u95e8，\u62c9\u591f 10 \u4e2a\u5c31\u5173，map \u4e0d\u4f1a\u88ab\u6267\u884c\u7b2c 11 \u6b21\u3002<\/li>\n
- WeeklyTemps \u662f\u5bb9\u5668（Iterable），\u6301\u6709\u539f\u59cb\u6570\u7ec4；\u6bcf\u6b21 iterator() \u90fd new \u4e00\u4e2a TempIter，\u6240\u4ee5\u4e0b\u9762\u80fd\u5bf9\u540c\u4e00\u5468\u6570\u636e\u53cd\u590d\u505a 5 \u6b21\u7edf\u8ba1，\u4e92\u4e0d\u5e72\u6270\u3002<\/li>\n
- -99 \u7684\u7f3a\u5931\u503c\u7edf\u4e00\u5728 filter \u9636\u6bb5\u5254\u9664，\u540e\u7eed\u6240\u6709\u7edf\u8ba1\u62ff\u5230\u7684\u90fd\u662f\u5e72\u51c0\u6570\u636e\u2014\u2014\u8fd9\u6b63\u662f\u6d41\u6c34\u7ebf\u7684\u4ef7\u503c：\u8fc7\u6ee4\u903b\u8f91\u53ea\u5199\u4e00\u6b21\u3002<\/li>\n
- max() \u8fd4\u56de Option<Int64>，?? -1 \u5728\u5168\u7a7a\u65f6\u515c\u5e95，\u7edd\u4e0d\u4f1a\u629b\u5f02\u5e38\u3002<\/li>\n
- enumerate() \u4ea7\u51fa\u5143\u7ec4，\u5fc5\u987b p[0]\u3001p[1] \u53d6\u5206\u91cf\u3002<\/li>\n<\/ul>\n
\u53ef\u4ee5\u81ea\u5df1\u52a8\u624b\u6539：<\/p>\n
- \n
- \u628a take(10) \u6539\u6210 take(20)，\u786e\u8ba4\u5e73\u65b9\u6570\u7ee7\u7eed\u6b63\u786e\u4ea7\u51fa\u3001\u4e14\u7a0b\u5e8f\u6b63\u5e38\u9000\u51fa；<\/li>\n
- \u628a\u5468\u6570\u636e\u6539\u6210\u5168 -99，\u89c2\u5bdf reduce \u8d70 None \u5206\u652f\u3001max() \u6253\u5370\u515c\u5e95\u503c -1；<\/li>\n
- \u7528 fold \u8ba1\u7b97\u6709\u6548\u6c14\u6e29\u7684\u5e73\u5747\u503c（\u63d0\u793a：\u5148\u6c42\u548c\u3001\u518d\u9664\u4ee5 count，\u6ce8\u610f\u6574\u6570\u9664\u6cd5）\u3002<\/li>\n<\/ul>\n
9.3 \u7528\u8c03\u8bd5\u5668\u89c2\u5bdf\u60f0\u6027\u6c42\u503c<\/h4>\n
- \u5728 Naturals \u7684 next() \u91cc let v = n \u4e00\u884c\u6253\u65ad\u70b9，Shift + F9 \u542f\u52a8\u8c03\u8bd5；<\/li>\n
- \u5355\u6b65\u89c2\u5bdf：take(10) \u9a71\u52a8\u4e0b，next() \u6070\u597d\u88ab\u8c03\u7528 10 \u6b21，\u7b2c 11 \u6b21\u6c38\u8fdc\u4e0d\u4f1a\u53d1\u751f\u2014\u2014\u4eb2\u773c\u786e\u8ba4"\u7ec8\u7aef\u64cd\u4f5c\u8981\u591a\u5c11\u624d\u7b97\u591a\u5c11"；<\/li>\n
- \u5728 TempIter.next() \u6253\u65ad\u70b9，\u89c2\u5bdf filter \u5254\u9664 -99 \u65f6\u6e38\u6807\u5982\u4f55"\u591a\u8d70\u4e00\u6b65"\u624d\u5410\u51fa\u4e00\u4e2a\u6709\u6548\u503c；<\/li>\n
- \u5c55\u5f00 Variables \u9762\u677f\u91cc\u7684 this，\u5bf9\u6bd4\u6bcf\u6b21 iterator() \u4ea7\u751f\u7684 TempIter \u7684 i \u90fd\u662f\u72ec\u7acb\u4ece 0 \u5f00\u59cb\u7684\u3002<\/li>\n
\u8c03\u8bd5\u7ed3\u675f\u70b9\u505c\u6b62\u6309\u94ae\u3002<\/p>\n
\n\u5341\u3001\u5e38\u89c1\u95ee\u9898 FAQ<\/h3>\n
Q1：\u8fed\u4ee3\u5668\u548c\u6570\u7ec4\u904d\u5386，\u65e5\u5e38\u5199\u4ee3\u7801\u8be5\u7528\u54ea\u4e2a？ \u6570\u636e\u5df2\u7ecf\u5728\u6570\u7ec4\u91cc\u3001\u4e14\u8981\u591a\u6b21\u4f7f\u7528，\u76f4\u63a5\u904d\u5386\u6570\u7ec4（\u6700\u7b80\u5355）\u3002\u8fed\u4ee3\u5668\u7684\u4ef7\u503c\u5728\u4e09\u79cd\u60c5\u51b5：\u6570\u636e\u91cf\u5f88\u5927\/\u65e0\u9650\u3001\u6570\u636e\u662f\u8fb9\u4ea7\u751f\u8fb9\u5904\u7406\u7684\u3001\u60f3\u628a\u591a\u4e2a\u53d8\u6362\u4e32\u6210\u4e00\u6761\u4e0d\u4ea7\u751f\u4e2d\u95f4\u96c6\u5408\u7684\u6d41\u6c34\u7ebf\u3002<\/p>\n
Q2：Iterator \u548c Iterable \u5230\u5e95\u600e\u4e48\u9009？ \u4f60\u5728\u63cf\u8ff0"\u4e00\u4e2a\u6570\u636e\u96c6\u5408"（\u80fd\u88ab\u53cd\u590d\u904d\u5386）\u2192 \u5b9e\u73b0 Iterable，\u914d\u4e00\u4e2a\u6e38\u6807\u7c7b；\u4f60\u5728\u63cf\u8ff0"\u4e00\u4e32\u6309\u89c4\u5219\u751f\u6210\u7684\u503c"（\u5c24\u5176\u662f\u7b97\u51fa\u6765\u7684\u3001\u65e0\u9650\u7684\u3001\u4e00\u6b21\u6027\u7684）\u2192 \u76f4\u63a5\u5b9e\u73b0 Iterator\u3002<\/p>\n
Q3：\u4e3a\u4ec0\u4e48\u6211\u7684\u7c7b\u5199\u4e86 iterator() \u65b9\u6cd5，for-in \u8fd8\u662f\u62a5\u9519？ \u5149\u6709\u65b9\u6cd5\u4e0d\u591f，\u5fc5\u987b\u5728\u7c7b\u58f0\u660e\u91cc\u5199 <: Iterable<T>\u3002\u4ed3\u9889\u7684 for-in \u53ea\u8ba4\u63a5\u53e3，\u4e0d\u8ba4"\u7ed3\u6784\u4e0a\u6070\u597d\u957f\u8fd9\u6837"\u7684\u9e2d\u5b50\u7c7b\u578b\u3002\u62a5\u9519\u6587\u6848\u662f does not implement Iterator\u3002<\/p>\n
Q4：\u4ed3\u9889\u6709 yield \/ \u751f\u6210\u5668\u51fd\u6570\u5417？ 1.1.3 \u6ca1\u6709\u3002sequence { } \u5757\u548c\u51fd\u6570\u4f53\u91cc\u7684 yield(x) \u90fd\u4f1a\u62a5"\u672a\u58f0\u660e\u6807\u8bc6\u7b26"\u3002\u751f\u6210\u5e8f\u5217\u7684\u552f\u4e00\u65b9\u5f0f\u662f\u624b\u5199\u5b9e\u73b0 Iterator \u7684\u7c7b，\u7528\u5b57\u6bb5\u4fdd\u5b58\u72b6\u6001\u3001\u5728 next() \u91cc\u63a8\u8fdb\u3002<\/p>\n
Q5：\u4e3a\u4ec0\u4e48 arr.map { … } \u548c arr.iterator().map { … } \u5199\u6cd5\u5dee\u4e0d\u591a，\u8981\u5f3a\u8c03\u533a\u522b？ \u524d\u8005\u6bcf\u4e00\u6b65\u7acb\u5373\u4ea7\u51fa\u65b0\u6570\u7ec4（\u4e2d\u95f4\u7ed3\u679c\u5168\u90e8\u9a7b\u7559\u5185\u5b58）；\u540e\u8005\u53ea\u5728\u7ec8\u7aef\u64cd\u4f5c\u65f6\u6309\u9700\u8ba1\u7b97，\u4e0d\u4ea7\u751f\u4e2d\u95f4\u6570\u7ec4\u3002\u6570\u636e\u91cf\u5c0f\u770b\u4e0d\u51fa\u5dee\u522b，\u5904\u7406\u5927\u6587\u4ef6\/\u65e0\u9650\u6d41\u65f6\u662f\u5929\u58e4\u4e4b\u522b\u3002<\/p>\n
Q6：\u8fed\u4ee3\u5668\u904d\u5386\u4e00\u904d\u540e\u8fd8\u80fd\u518d\u904d\u5386\u5417？ \u540c\u4e00\u4e2a\u8fed\u4ee3\u5668\u5bf9\u8c61\u4e0d\u80fd，\u6e38\u6807\u8017\u5c3d\u540e\u518d\u8c03 next() \u6c38\u8fdc\u662f None\u3002\u4f46 Iterable \u5bb9\u5668\u6bcf\u6b21 iterator() \u90fd\u4f1a\u7ed9\u4f60\u4e00\u4e2a\u65b0\u6e38\u6807，\u53ef\u4ee5\u53cd\u590d\u904d\u5386\u3002\u9700\u8981"\u518d\u6765\u4e00\u904d"\u65f6，\u91cd\u65b0\u8c03\u7528 iterator()\u3002<\/p>\n
Q7：zip \/ enumerate \u7684\u7ed3\u679c\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u6253\u5370？ \u5b83\u4eec\u4ea7\u51fa\u7684\u662f\u5143\u7ec4，\u6807\u51c6\u5e93\u7684\u5143\u7ec4\u6ca1\u6709\u5b9e\u73b0 ToString，\u5b57\u7b26\u4e32\u63d2\u503c\u4f1a\u62a5\u9519\u3002\u7528\u4e0b\u6807\u53d6\u5206\u91cf：p[0]\u3001p[1]，\u6216\u8005\u89e3\u6784\u540e\u518d\u6253\u5370\u3002<\/p>\n
Q8：\u600e\u4e48\u628a\u8fed\u4ee3\u5668\u7ed3\u679c\u5b58\u56de\u6570\u7ec4？ \u8fed\u4ee3\u5668\u4e0a\u6ca1\u6709 toArray()\u3002\u5148\u5efa\u4e00\u4e2a ArrayList<T>()，\u7528 forEach { x => list.add(x) } \u6536\u96c6，\u518d\u8c03 list.toArray()\u3002<\/p>\n
Q9：for-in \u65e0\u9650\u8fed\u4ee3\u5668\u4f1a\u600e\u6837？ \u4f1a\u6b7b\u5faa\u73af（\u65e0\u9650\u8fed\u4ee3\u5668\u7684 next() \u6c38\u8fdc\u8fd4\u56de Some）\u3002\u65e0\u9650\u6d41\u5fc5\u987b\u7528 take(n)\u3001any { \u6761\u4ef6 } \u8fd9\u7c7b\u81ea\u5e26\u7ec8\u6b62\u80fd\u529b\u7684\u64cd\u4f5c\u6d88\u8d39，\u786e\u4fdd\u5b83\u8fdf\u65e9\u4f1a\u505c\u3002<\/p>\n
Q10：reduce \u548c fold \u6709\u4ec0\u4e48\u533a\u522b？\u7a7a\u6d41\u4f1a\u5d29\u5417？ fold(\u521d\u503c) { … } \u5fc5\u987b\u7ed9\u521d\u503c，\u7a7a\u6d41\u76f4\u63a5\u8fd4\u56de\u521d\u503c；reduce { … } \u4e0d\u7ed9\u521d\u503c，\u8fd4\u56de Option，\u7a7a\u6d41\u5f97\u5230 None\u3002\u4e8c\u8005\u90fd\u4e0d\u4f1a\u56e0\u4e3a\u7a7a\u5e8f\u5217\u5d29\u6e83\u2014\u2014\u8fd9\u6bd4\u5f88\u591a\u8bed\u8a00\u629b\u5f02\u5e38\u7684\u8bbe\u8ba1\u66f4\u5b89\u5168\u3002<\/p>\n
\n\u5341\u4e00\u3001\u8bfe\u540e\u7ec3\u4e60<\/h3>\n
- \u5199\u4e00\u4e2a Countdown <: Iterator<Int64>，\u4ece\u6784\u9020\u53c2\u6570 n \u5f00\u59cb\u5012\u7740\u6570\u6570\u5230 1，\u4e4b\u540e\u8fd4\u56de None\u3002\u7528 for-in \u6253\u5370 Countdown(5)，\u5e94\u8f93\u51fa 5 4 3 2 1\u3002<\/li>\n
- \u7ed9\u7b2c 1 \u9898\u7684\u5012\u8ba1\u65f6\u63a5\u4e0a\u94fe\u5f0f\u64cd\u4f5c：\u53ea\u4fdd\u7559\u5076\u6570\u3001\u6bcf\u4e2a\u6570\u5e73\u65b9\u3001\u7528 forEach \u6253\u5370\u3002\u9884\u671f\u8f93\u51fa 16 4（\u5373 4\u00b2\u30012\u00b2）\u3002<\/li>\n
- \u5199\u4e00\u4e2a\u65e0\u9650\u8fed\u4ee3\u5668 MultiplesOf(k: Int64)，\u4f9d\u6b21\u4ea7\u51fa k \u7684\u6240\u6709\u500d\u6570（k\u30012k\u30013k\u2026\u2026）\u3002\u7528 take(5) \u5b89\u5168\u5730\u53d6\u51fa 3 \u7684\u524d 5 \u4e2a\u500d\u6570\u5e76\u6253\u5370\u3002<\/li>\n
- \u7528 fold \u5b9e\u73b0\u4e00\u4e2a\u51fd\u6570，\u63a5\u6536\u4e00\u4e2a Iterator<Int64>，\u8fd4\u56de\u5176\u4e2d\u6b63\u6570\u7684\u5e73\u5747\u503c（\u63d0\u793a：\u53ef\u4ee5 fold \u51fa\u4e00\u4e2a"\u4e2a\u6570+\u603b\u548c"\u7684\u4e8c\u5143\u7ec4，\u5143\u7ec4\u5b57\u6bb5\u7528 [0]\u3001[1] \u8bbf\u95ee；\u6ce8\u610f\u7a7a\u6d41\u9664\u96f6，\u7528 match \u5904\u7406）\u3002<\/li>\n
- \u7efc\u5408：\u5b9a\u4e49\u4e00\u4e2a Sentence \u5bb9\u5668\u5b9e\u73b0 Iterable<String>（\u5185\u90e8\u7528\u4e00\u4e2a Array<String> \u5b58\u5355\u8bcd），\u5199\u4e13\u5c5e\u6e38\u6807\u7c7b\u3002\u7136\u540e\u7528\u8fed\u4ee3\u5668\u94fe\u5b8c\u6210：\u8fc7\u6ee4\u6389\u957f\u5ea6\u5c0f\u4e8e 3 \u7684\u5355\u8bcd\u3001enumerate \u7f16\u53f7\u3001\u53ea\u53d6\u524d 3 \u4e2a\u3001\u6309 #\u7f16\u53f7:\u5355\u8bcd \u7684\u683c\u5f0f\u6253\u5370\u3002<\/li>\n
\n\u4e0b\u8282\u9884\u544a<\/h3>\n
\u51fd\u6570\u5f0f\u6a21\u5757（11～14 \u8bfe）\u5230\u6b64\u6536\u5b98：\u4ece\u547d\u540d\u51fd\u6570\u3001\u533f\u540d Lambda\u3001\u95ed\u5305\u6355\u83b7，\u5230\u4eca\u5929\u6309\u9700\u53d6\u503c\u7684\u8fed\u4ee3\u5668，\u4f60\u5df2\u7ecf\u80fd\u7528"\u503c + \u51fd\u6570"\u8868\u8fbe\u76f8\u5f53\u590d\u6742\u7684\u903b\u8f91\u4e86\u3002\u4f46\u5199\u5927\u578b\u7a0b\u5e8f\u8fd8\u9700\u8981\u53e6\u4e00\u5957\u7ec4\u7ec7\u4ee3\u7801\u7684\u6b66\u5668\u2014\u2014\u628a\u6570\u636e\u548c\u64cd\u4f5c\u6570\u636e\u7684\u65b9\u6cd5\u7ed1\u5728\u4e00\u8d77\u3002\u7b2c 15 \u8bfe \u7ed3\u6784\u4f53 struct \u4e0e\u7c7b class \u6b63\u5f0f\u8fdb\u5165\u9762\u5411\u5bf9\u8c61\u4e16\u754c：\u503c\u7c7b\u578b\u4e0e\u5f15\u7528\u7c7b\u578b\u7684\u6839\u672c\u5dee\u5f02\u3001\u4ec0\u4e48\u65f6\u5019\u8be5\u7528\u8c01\u3001init \u6784\u9020\u51fd\u6570\u7684\u5b8c\u6574\u89c4\u5219\u3002\u6211\u4eec\u4e0b\u8282\u8bfe\u89c1！<\/p>\n
\n\u7cfb\u5217\u8bf4\u660e：\u672c\u7cfb\u5217\u57fa\u4e8e Windows \u5e73\u53f0 + CIDE + \u4ed3\u9889 SDK（1.1.3）\u7f16\u5199，\u6240\u6709\u4ee3\u7801\u5747\u5df2\u5b9e\u9645\u7f16\u8bd1\u8fd0\u884c\u901a\u8fc7\u3002\u5982\u9047 SDK \u7248\u672c\u5dee\u5f02\u5bfc\u81f4\u7684\u7ec6\u8282\u51fa\u5165（\u4f8b\u5982\u65b0\u7248\u672c\u8865\u5145\u4e86 yield \u751f\u6210\u5668\u8bed\u6cd5\u3001\u4e3a\u8fed\u4ee3\u5668\u589e\u52a0\u4e86 toArray() \u7b49），\u4ee5\u4f60\u672c\u5730\u7248\u672c\u4e3a\u51c6，\u6b22\u8fce\u8bc4\u8bba\u533a\u4ea4\u6d41\u3002<\/p>\n
\n💬 \u9047\u5230\u95ee\u9898？\u626b\u7801\u8054\u7cfb\u4f5c\u8005<\/h3>\n
\u8ddf\u7740\u8bfe\u7a0b\u7ec3\u4e60\u65f6，\u5982\u679c\u5728 SDK \u5b89\u88c5\u3001\u73af\u5883\u53d8\u91cf\u914d\u7f6e\u3001\u7f16\u8bd1\u62a5\u9519\u6216\u8c03\u8bd5\u4e0a\u5361\u4f4f，\u6b22\u8fce\u626b\u7801\u52a0\u4f5c\u8005\u4f01\u4e1a\u5fae\u4fe1\u76f4\u63a5\u54a8\u8be2（\u8bf7\u5907\u6ce8"\u4ed3\u9889\u8bfe\u7a0b"）：
![\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260923014042-6ab32e1a85529.png\")
<\/p>\n\u79bb\u7ebf\u73af\u5883\u4e0b\u56fe\u7247\u53ef\u80fd\u52a0\u8f7d\u4e0d\u51fa\u6765，\u4e5f\u53ef\u4ee5\u5728 CIDE \u83dc\u5355 Help \u25b8 \u8054\u7cfb\u4f5c\u8005 \/ Contact \u4e2d\u67e5\u770b\u540c\u4e00\u5f20\u4e8c\u7ef4\u7801（\u5e94\u7528\u5185\u7f6e\u515c\u5e95\u56fe，\u65e0\u9700\u8054\u7f51）\u3002<\/p>\n
\n📥 \u5de5\u5177\u4e0b\u8f7d<\/h3>\n
\u672c\u7cfb\u5217\u5168\u7a0b\u4f7f\u7528\u7684\u4ed3\u9889 IDE \u2014\u2014 CIDE（\u514d\u8d39\u5f00\u6e90\u3001\u793e\u533a\u7248）：<\/p>\n
- \n
- GitCode \u4ed3\u5e93 \/ \u5b89\u88c5\u5305\u4e0b\u8f7d：https:\/\/gitcode.com\/wp_upala\/cide<\/li>\n
- \u6253\u5f00\u9875\u9762\u540e\u8fdb\u5165 \u53d1\u884c\u7248（Releases），\u4e24\u79cd\u5305\u4efb\u9009\u5176\u4e00：\n
- \n
- \u5b89\u88c5\u7248：\u4e0b\u8f7d CIDE-<\u7248\u672c>-x64-Setup.exe，\u53cc\u51fb\u5b89\u88c5，\u9002\u5408\u65e5\u5e38\u957f\u671f\u4f7f\u7528；<\/li>\n
- \u514d\u5b89\u88c5\u7248（Portable）：\u4e0b\u8f7d CIDE-<\u7248\u672c>-x64-Portable.zip，\u89e3\u538b\u5230\u4efb\u610f\u76ee\u5f55\u5373\u7528，\u4e0d\u5199\u6ce8\u518c\u8868\u3001\u4e0d\u7559\u5b89\u88c5\u75d5\u8ff9，\u62f7\u5230 U \u76d8\u4e5f\u80fd\u5728\u522b\u7684\u7535\u8111\u76f4\u63a5\u8fd0\u884c（\u5305\u5185\u9644\u300a\u4f7f\u7528\u8bf4\u660e.txt\u300b）\u3002\u9002\u5408\u5148\u8bd5\u7528\u3001\u6216\u5728\u53d7\u9650\u7535\u8111\u4e0a\u5b66\u4e60\u672c\u7cfb\u5217\u8bfe\u7a0b\u3002<\/li>\n<\/ul>\n<\/li>\n
- \u4ed3\u9889 SDK \u8bf7\u524d\u5f80\u4ed3\u9889\u7f16\u7a0b\u8bed\u8a00\u5b98\u7f51\u4e0b\u8f7d：https:\/\/cangjie-lang.cn<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
\u3010\u4ed3\u9889\u8bed\u8a00\u5165\u95e8 \u00b7 \u7b2c14\u8bfe\u3011\u8fed\u4ee3\u5668 Iterator \u4e0e\u60f0\u6027\u5e8f\u5217 \u7b2c 13 \u8bfe\u7528\u95ed\u5305\u505a\u51fa\u4e86\\”\u80fd\u8bb0\u4f4f\u72b6\u6001\u7684\u51fd\u6570\\”，\u8fd9\u8282\u8bfe\u89e3\u51b3\u4e00\u4e2a\u66f4\u5b9e\u9645\u7684\u95ee\u9898：\u60f3\u9010\u4e2a\u4ea7\u51fa\u4e00\u7cfb\u5217\u503c\u2014\u2014\u5927\u6587\u4ef6\u7684\u9010\u884c\u8bfb\u53d6\u3001\u4f20\u611f\u5668\u6e90\u6e90\u4e0d\u65ad\u7684\u8bfb\u6570\u3001\u751a\u81f3\u6590\u6ce2\u90a3\u5951\u90a3\u6837\u65e0\u7a77\u65e0\u5c3d\u7684\u6570\u5217\u2014\u2014\u96be\u9053\u90fd\u8981\u5148\u4e00\u53e3\u6c14\u7b97\u5b8c\u585e\u8fdb\u6570\u7ec4？\u5f53\u7136\u4e0d\u662f\u3002\u4ed3\u9889\u7684\u7b54\u6848\u662f\u8fed\u4ee3\u5668（Iterator）：\u7528\u4e00\u4e2a next() \u65b9\u6cd5\u6309\u9700\u53d6\u503c，\u7528\u591a\u5c11\u7b97\u591a\u5c11\u3002 \u672c\u6587\u6240\u6709\u4ee3\u7801<\/p>\n","protected":false},"author":2,"featured_media":109077,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[70,190,227],"topic":[],"class_list":["post-109078","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-ide","tag-190","tag-227"],"yoast_head":"\n
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\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/109078.html","og_locale":"zh_CN","og_type":"article","og_title":"\u3010\u4ed3\u9889\u8bed\u8a00\u5165\u95e8 \u00b7 \u7b2c14\u8bfe\u3011 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u3010\u4ed3\u9889\u8bed\u8a00\u5165\u95e8 \u00b7 \u7b2c14\u8bfe\u3011\u8fed\u4ee3\u5668 Iterator \u4e0e\u60f0\u6027\u5e8f\u5217 \u7b2c 13 \u8bfe\u7528\u95ed\u5305\u505a\u51fa\u4e86\"\u80fd\u8bb0\u4f4f\u72b6\u6001\u7684\u51fd\u6570\"，\u8fd9\u8282\u8bfe\u89e3\u51b3\u4e00\u4e2a\u66f4\u5b9e\u9645\u7684\u95ee\u9898：\u60f3\u9010\u4e2a\u4ea7\u51fa\u4e00\u7cfb\u5217\u503c\u2014\u2014\u5927\u6587\u4ef6\u7684\u9010\u884c\u8bfb\u53d6\u3001\u4f20\u611f\u5668\u6e90\u6e90\u4e0d\u65ad\u7684\u8bfb\u6570\u3001\u751a\u81f3\u6590\u6ce2\u90a3\u5951\u90a3\u6837\u65e0\u7a77\u65e0\u5c3d\u7684\u6570\u5217\u2014\u2014\u96be\u9053\u90fd\u8981\u5148\u4e00\u53e3\u6c14\u7b97\u5b8c\u585e\u8fdb\u6570\u7ec4？\u5f53\u7136\u4e0d\u662f\u3002\u4ed3\u9889\u7684\u7b54\u6848\u662f\u8fed\u4ee3\u5668（Iterator）：\u7528\u4e00\u4e2a next() \u65b9\u6cd5\u6309\u9700\u53d6\u503c，\u7528\u591a\u5c11\u7b97\u591a\u5c11\u3002 \u672c\u6587\u6240\u6709\u4ee3\u7801","og_url":"https:\/\/www.wsisp.com\/helps\/109078.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-09-23T01:40:44+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260923014042-6ab32e1a85529.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"10 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/109078.html","url":"https:\/\/www.wsisp.com\/helps\/109078.html","name":"\u3010\u4ed3\u9889\u8bed\u8a00\u5165\u95e8 \u00b7 \u7b2c14\u8bfe\u3011 - 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