Array.prototype.flat/implementation.js at main · es-shims/Array.prototype.flat · GitHub

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'use strict';

var ArraySpeciesCreate = require('es-abstract/2024/ArraySpeciesCreate');

var FlattenIntoArray = require('es-abstract/2024/FlattenIntoArray');

var Get = require('es-abstract/2024/Get');

var ToIntegerOrInfinity = require('es-abstract/2024/ToIntegerOrInfinity');

var ToLength = require('es-abstract/2024/ToLength');

var ToObject = require('es-abstract/2024/ToObject');

module.exports = function flat() {

var O = ToObject(this);

var sourceLen = ToLength(Get(O, 'length'));

var depthNum = 1;

if (arguments.length > 0 && typeof arguments[0] !== 'undefined') {

depthNum = ToIntegerOrInfinity(arguments[0]);

}

var A = ArraySpeciesCreate(O, 0);

FlattenIntoArray(A, O, sourceLen, 0, depthNum);

return A;

};