51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
'use strict';
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var ArraySpeciesCreate = require('es-abstract/2019/ArraySpeciesCreate');
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var Call = require('es-abstract/2019/Call');
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var CreateDataPropertyOrThrow = require('es-abstract/2019/CreateDataPropertyOrThrow');
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var Get = require('es-abstract/2019/Get');
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var HasProperty = require('es-abstract/2019/HasProperty');
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var IsCallable = require('es-abstract/2019/IsCallable');
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var ToUint32 = require('es-abstract/2019/ToUint32');
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var ToObject = require('es-abstract/2019/ToObject');
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var ToString = require('es-abstract/2019/ToString');
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var callBound = require('es-abstract/helpers/callBound');
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var isString = require('is-string');
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// Check failure of by-index access of string characters (IE < 9) and failure of `0 in boxedString` (Rhino)
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var boxedString = Object('a');
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var splitString = boxedString[0] !== 'a' || !(0 in boxedString);
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var strSplit = callBound('String.prototype.split');
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module.exports = function map(callbackfn) {
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var O = ToObject(this);
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var self = splitString && isString(O) ? strSplit(O, '') : O;
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var len = ToUint32(self.length);
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// If no callback function or if callback is not a callable function
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if (!IsCallable(callbackfn)) {
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throw new TypeError('Array.prototype.map callback must be a function');
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}
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var T;
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if (arguments.length > 1) {
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T = arguments[1];
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}
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var A = ArraySpeciesCreate(O, len);
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var k = 0;
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while (k < len) {
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var Pk = ToString(k);
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var kPresent = HasProperty(O, Pk);
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if (kPresent) {
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var kValue = Get(O, Pk);
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var mappedValue = Call(callbackfn, T, [kValue, k, O]);
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CreateDataPropertyOrThrow(A, Pk, mappedValue);
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}
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k += 1;
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}
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return A;
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};
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