Array.prototype.myForEach = function (callback, thisArg = undefined) {

    if (typeof callback !== 'function') {

        throw new TypeError(`${callback} is not a function`);

    }

    let index = 0

    const len = this.length

    while (index < len) {

        if (index in this) callback.call(thisArg, this[index], index, this)

        index++

    }

}