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75 lines
1.9 KiB
75 lines
1.9 KiB
4 years ago
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'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var $iterator = GetIntrinsic('%Symbol.iterator%', true);
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var callBound = require('../helpers/callBound');
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var $arrayJoin = callBound('Array.prototype.join');
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var $arrayPush = callBound('Array.prototype.push');
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var $stringSlice = callBound('String.prototype.slice');
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var $stringSplit = callBound('String.prototype.split');
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var AdvanceStringIndex = require('./AdvanceStringIndex');
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var GetIterator = require('./GetIterator');
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var GetMethod = require('./GetMethod');
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var IsArray = require('./IsArray');
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var IteratorStep = require('./IteratorStep');
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var IteratorValue = require('./IteratorValue');
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var ToObject = require('./ToObject');
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var Type = require('./Type');
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// https://www.ecma-international.org/ecma-262/7.0/#sec-iterabletoarraylike
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module.exports = function IterableToArrayLike(items) {
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var usingIterator;
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if ($iterator) {
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usingIterator = GetMethod(items, $iterator);
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} else if (IsArray(items)) {
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usingIterator = function () {
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var i = -1;
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var arr = this; // eslint-disable-line no-invalid-this
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return {
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next: function () {
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i += 1;
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return {
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done: i >= arr.length,
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value: arr[i]
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};
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}
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};
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};
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} else if (Type(items) === 'String') {
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usingIterator = function () {
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var i = 0;
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return {
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next: function () {
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var nextIndex = AdvanceStringIndex(items, i, true);
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var value = $arrayJoin($stringSplit($stringSlice(items, i, nextIndex), ''), '');
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i = nextIndex;
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return {
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done: nextIndex > items.length,
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value: value
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};
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}
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};
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};
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}
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if (typeof usingIterator !== 'undefined') {
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var iterator = GetIterator(items, usingIterator);
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var values = [];
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var next = true;
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while (next) {
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next = IteratorStep(iterator);
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if (next) {
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var nextValue = IteratorValue(next);
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$arrayPush(values, nextValue);
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}
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}
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return values;
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}
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return ToObject(items);
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};
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