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21 lines
837 B
21 lines
837 B
'use strict';
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var $ = require('../internals/export');
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var flattenIntoArray = require('../internals/flatten-into-array');
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var aCallable = require('../internals/a-callable');
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var toObject = require('../internals/to-object');
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var lengthOfArrayLike = require('../internals/length-of-array-like');
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var arraySpeciesCreate = require('../internals/array-species-create');
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// `Array.prototype.flatMap` method
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// https://tc39.es/ecma262/#sec-array.prototype.flatmap
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$({ target: 'Array', proto: true }, {
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flatMap: function flatMap(callbackfn /* , thisArg */) {
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var O = toObject(this);
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var sourceLen = lengthOfArrayLike(O);
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var A;
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aCallable(callbackfn);
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A = arraySpeciesCreate(O, 0);
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A.length = flattenIntoArray(A, O, O, sourceLen, 0, 1, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
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return A;
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}
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});
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