core-js/modules/es.array.map.js

'use strict';
var $ = require('../internals/export');
var $map = require('../internals/array-iteration').map;
var arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');
var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');

var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('map');
// FF49- issue
var USES_TO_LENGTH = arrayMethodUsesToLength('map');

// `Array.prototype.map` method
// https://tc39.es/ecma262/#sec-array.prototype.map
// with adding support of @@species
$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH }, {
  map: function map(callbackfn /* , thisArg */) {
    return $map(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
  }
});