es.array.flat-map.js
No OneTemporary
Actions

Size

803 B

Subscribers

None

es.array.flat-map.js
View Options

	'use strict';
	var $ = require('../internals/export');
	var flattenIntoArray = require('../internals/flatten-into-array');
	var toObject = require('../internals/to-object');
	var toLength = require('../internals/to-length');
	var aFunction = require('../internals/a-function');
	var arraySpeciesCreate = require('../internals/array-species-create');

	// `Array.prototype.flatMap` method
	// https://github.com/tc39/proposal-flatMap
	$({ target: 'Array', proto: true }, {
	flatMap: function flatMap(callbackfn /* , thisArg */) {
	var O = toObject(this);
	var sourceLen = toLength(O.length);
	var A;
	aFunction(callbackfn);
	A = arraySpeciesCreate(O, 0);
	A.length = flattenIntoArray(A, O, O, sourceLen, 0, 1, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	return A;
	}
	});