es.array.flat-map.js
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es.array.flat-map.js
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	'use strict';
	var $ = require('../internals/export');
	var flattenIntoArray = require('../internals/flatten-into-array');
	var aCallable = require('../internals/a-callable');
	var toObject = require('../internals/to-object');
	var lengthOfArrayLike = require('../internals/length-of-array-like');
	var arraySpeciesCreate = require('../internals/array-species-create');

	// `Array.prototype.flatMap` method
	// https://tc39.es/ecma262/#sec-array.prototype.flatmap
	$({ target: 'Array', proto: true }, {
	flatMap: function flatMap(callbackfn /* , thisArg */) {
	var O = toObject(this);
	var sourceLen = lengthOfArrayLike(O);
	var A;
	aCallable(callbackfn);
	A = arraySpeciesCreate(O, 0);
	A.length = flattenIntoArray(A, O, O, sourceLen, 0, 1, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	return A;
	}
	});