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Iterators ES6
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| const arr = [1,2,3]; | |
| arr.map((i, item) => { | |
| console.log(item) | |
| }); | |
| arr.forEach((item, i) => console.log(item, i)) | |
| for (let item of arr) { | |
| console.log(item); | |
| } | |
| for (let char of 'Hello') { | |
| console.log(char) | |
| } | |
| let types = new Set(['foo', 'tree', 'one']); | |
| for(let type of types) { | |
| console.log(type); | |
| } | |
| let obj = { | |
| foo: 'bar', | |
| baz: 'aux' | |
| }; | |
| for (let key of Object.keys(obj)) { | |
| console.log(key); | |
| } | |
| let iterator = { | |
| [Symbol.iterator]: function() { | |
| return this; | |
| }, | |
| next: function() { | |
| return { value: 'hey', done: false } | |
| // всегда возвращает это | |
| } | |
| } | |
| const interator1 = iterator[Symbol.iterator](); | |
| console.log( interator1.next() ); | |
| function createIterator(arr) { | |
| let index = 0; | |
| return { | |
| next: () => { | |
| return index < arr.length | |
| ? { value: arr[index++], done: false } | |
| : { done: true }; | |
| } | |
| } | |
| } | |
| const myIterator = createIterator(['hey', 'yo', 'ya']); | |
| console.log(myIterator.next()) | |
| console.log(myIterator.next()) | |
| console.log(myIterator.next()) | |
| console.log(myIterator.next()) |
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