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async/lib/internal/iterator.js /
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| import isArrayLike from './isArrayLike.js' | |
| import getIterator from './getIterator.js' | |
| function createArrayIterator(coll) { | |
| var i = -1; | |
| var len = coll.length; | |
| return function next() { | |
| return ++i < len ? {value: coll[i], key: i} : null; | |
| } | |
| } | |
| function createES2015Iterator(iterator) { | |
| var i = -1; | |
| return function next() { | |
| var item = iterator.next(); | |
| if (item.done) | |
| return null; | |
| i++; | |
| return {value: item.value, key: i}; | |
| } | |
| } | |
| function createObjectIterator(obj) { | |
| var okeys = obj ? Object.keys(obj) : []; | |
| var i = -1; | |
| var len = okeys.length; | |
| return function next() { | |
| var key = okeys[++i]; | |
| if (key === '__proto__') { | |
| return next(); | |
| } | |
| return i < len ? {value: obj[key], key} : null; | |
| }; | |
| } | |
| export default function createIterator(coll) { | |
| if (isArrayLike(coll)) { | |
| return createArrayIterator(coll); | |
| } | |
| var iterator = getIterator(coll); | |
| return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll); | |
| } |