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106 lines
2.9 KiB
106 lines
2.9 KiB
'use strict';
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var iteratorSymbol = require('es6-symbol').iterator
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, isArguments = require('../../function/is-arguments')
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, isFunction = require('../../function/is-function')
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, toPosInt = require('../../number/to-pos-integer')
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, callable = require('../../object/valid-callable')
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, validValue = require('../../object/valid-value')
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, isString = require('../../string/is-string')
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, isArray = Array.isArray, call = Function.prototype.call
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, desc = { configurable: true, enumerable: true, writable: true, value: null }
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, defineProperty = Object.defineProperty;
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module.exports = function (arrayLike/*, mapFn, thisArg*/) {
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var mapFn = arguments[1], thisArg = arguments[2], Constructor, i, j, arr, l, code, iterator
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, result, getIterator, value;
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arrayLike = Object(validValue(arrayLike));
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if (mapFn != null) callable(mapFn);
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if (!this || (this === Array) || !isFunction(this)) {
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// Result: Plain array
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if (!mapFn) {
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if (isArguments(arrayLike)) {
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// Source: Arguments
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l = arrayLike.length;
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if (l !== 1) return Array.apply(null, arrayLike);
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arr = new Array(1);
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arr[0] = arrayLike[0];
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return arr;
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}
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if (isArray(arrayLike)) {
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// Source: Array
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arr = new Array(l = arrayLike.length);
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for (i = 0; i < l; ++i) arr[i] = arrayLike[i];
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return arr;
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}
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}
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arr = [];
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} else {
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// Result: Non plain array
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Constructor = this;
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}
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if (!isArray(arrayLike)) {
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if ((getIterator = arrayLike[iteratorSymbol]) !== undefined) {
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// Source: Iterator
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iterator = callable(getIterator).call(arrayLike);
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if (Constructor) arr = new Constructor();
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result = iterator.next();
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i = 0;
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while (!result.done) {
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value = mapFn ? call.call(mapFn, thisArg, result.value, i) : result.value;
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if (!Constructor) {
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arr[i] = value;
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} else {
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desc.value = value;
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defineProperty(arr, i, desc);
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}
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result = iterator.next();
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++i;
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}
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l = i;
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} else if (isString(arrayLike)) {
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// Source: String
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l = arrayLike.length;
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if (Constructor) arr = new Constructor();
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for (i = 0, j = 0; i < l; ++i) {
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value = arrayLike[i];
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if ((i + 1) < l) {
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code = value.charCodeAt(0);
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if ((code >= 0xD800) && (code <= 0xDBFF)) value += arrayLike[++i];
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}
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value = mapFn ? call.call(mapFn, thisArg, value, j) : value;
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if (!Constructor) {
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arr[j] = value;
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} else {
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desc.value = value;
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defineProperty(arr, j, desc);
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}
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++j;
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}
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l = j;
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}
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}
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if (l === undefined) {
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// Source: array or array-like
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l = toPosInt(arrayLike.length);
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if (Constructor) arr = new Constructor(l);
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for (i = 0; i < l; ++i) {
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value = mapFn ? call.call(mapFn, thisArg, arrayLike[i], i) : arrayLike[i];
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if (!Constructor) {
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arr[i] = value;
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} else {
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desc.value = value;
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defineProperty(arr, i, desc);
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}
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}
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}
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if (Constructor) {
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desc.value = null;
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arr.length = l;
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}
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return arr;
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};
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