Polyfill: filter

filter

Arguments

• Current value
• Index of the current value (optional)
• Array (optional)

Array.prototype.myFilter = function(cb) {
    let newArr = [];
    for (let i = 0; i < this.length; i++) {
        if (cb(this[i], i, this)) {
            newArr.push(this[i]);
        }
    }

    return newArr;
}