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- 'use strict';
- var $ = require('../internals/export');
- var flattenIntoArray = require('../internals/flatten-into-array');
- var toObject = require('../internals/to-object');
- var lengthOfArrayLike = require('../internals/length-of-array-like');
- var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
- var arraySpeciesCreate = require('../internals/array-species-create');
-
- // `Array.prototype.flat` method
- // https://tc39.es/ecma262/#sec-array.prototype.flat
- $({ target: 'Array', proto: true }, {
- flat: function flat(/* depthArg = 1 */) {
- var depthArg = arguments.length ? arguments[0] : undefined;
- var O = toObject(this);
- var sourceLen = lengthOfArrayLike(O);
- var A = arraySpeciesCreate(O, 0);
- A.length = flattenIntoArray(A, O, O, sourceLen, 0, depthArg === undefined ? 1 : toIntegerOrInfinity(depthArg));
- return A;
- }
- });
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