Edit File: _array-copy-within.js
// 22.1.3.3 Array.prototype.copyWithin(target, start, end = this.length) 'use strict'; var toObject = require('./_to-object'); var toAbsoluteIndex = require('./_to-absolute-index'); var toLength = require('./_to-length'); module.exports = [].copyWithin || function copyWithin(target /* = 0 */, start /* = 0, end = @length */) { var O = toObject(this); var len = toLength(O.length); var to = toAbsoluteIndex(target, len); var from = toAbsoluteIndex(start, len); var end = arguments.length > 2 ? arguments[2] : undefined; var count = Math.min((end === undefined ? len : toAbsoluteIndex(end, len)) - from, len - to); var inc = 1; if (from < to && to < from + count) { inc = -1; from += count - 1; to += count - 1; } while (count-- > 0) { if (from in O) O[to] = O[from]; else delete O[to]; to += inc; from += inc; } return O; };
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