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node_modules/core-js/modules/_flatten-into-array.js
| 39 lines
| 1.3 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| // https://tc39.github.io/proposal-flatMap/#sec-FlattenIntoArray | ||||
| var isArray = require('./_is-array'); | ||||
| var isObject = require('./_is-object'); | ||||
| var toLength = require('./_to-length'); | ||||
| var ctx = require('./_ctx'); | ||||
| var IS_CONCAT_SPREADABLE = require('./_wks')('isConcatSpreadable'); | ||||
| function flattenIntoArray(target, original, source, sourceLen, start, depth, mapper, thisArg) { | ||||
| var targetIndex = start; | ||||
| var sourceIndex = 0; | ||||
| var mapFn = mapper ? ctx(mapper, thisArg, 3) : false; | ||||
| var element, spreadable; | ||||
| while (sourceIndex < sourceLen) { | ||||
| if (sourceIndex in source) { | ||||
| element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex]; | ||||
| spreadable = false; | ||||
| if (isObject(element)) { | ||||
| spreadable = element[IS_CONCAT_SPREADABLE]; | ||||
| spreadable = spreadable !== undefined ? !!spreadable : isArray(element); | ||||
| } | ||||
| if (spreadable && depth > 0) { | ||||
| targetIndex = flattenIntoArray(target, original, element, toLength(element.length), targetIndex, depth - 1) - 1; | ||||
| } else { | ||||
| if (targetIndex >= 0x1fffffffffffff) throw TypeError(); | ||||
| target[targetIndex] = element; | ||||
| } | ||||
| targetIndex++; | ||||
| } | ||||
| sourceIndex++; | ||||
| } | ||||
| return targetIndex; | ||||
| } | ||||
| module.exports = flattenIntoArray; | ||||