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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;
- }
- });
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