Array.prototype.filter = function(callback, context) {
const ret = [];
for (let index = 0; index < this.length; index++) {
if (callback.call(context, this[index], index, this)) {
ret.push(this[index]);
}
}
return ret;
};
console.log([4, -1, 1, 2, 3].filter(x => x >= 2)); // [4, 2, 3];
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