Last change
on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
1.1 KB
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[6a3a178] | 1 | 'use strict';
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| 2 | var isArray = require('../internals/is-array');
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| 3 | var toLength = require('../internals/to-length');
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| 4 | var bind = require('../internals/function-bind-context');
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| 5 |
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| 6 | // `FlattenIntoArray` abstract operation
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| 7 | // https://tc39.github.io/proposal-flatMap/#sec-FlattenIntoArray
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| 8 | var flattenIntoArray = function (target, original, source, sourceLen, start, depth, mapper, thisArg) {
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| 9 | var targetIndex = start;
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| 10 | var sourceIndex = 0;
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| 11 | var mapFn = mapper ? bind(mapper, thisArg, 3) : false;
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| 12 | var element;
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| 13 |
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| 14 | while (sourceIndex < sourceLen) {
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| 15 | if (sourceIndex in source) {
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| 16 | element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex];
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| 17 |
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| 18 | if (depth > 0 && isArray(element)) {
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| 19 | targetIndex = flattenIntoArray(target, original, element, toLength(element.length), targetIndex, depth - 1) - 1;
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| 20 | } else {
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| 21 | if (targetIndex >= 0x1FFFFFFFFFFFFF) throw TypeError('Exceed the acceptable array length');
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| 22 | target[targetIndex] = element;
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| 23 | }
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| 24 |
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| 25 | targetIndex++;
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| 26 | }
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| 27 | sourceIndex++;
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| 28 | }
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| 29 | return targetIndex;
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| 30 | };
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| 31 |
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| 32 | module.exports = flattenIntoArray;
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