some-functions.js

function remove(array, index) {
    return array.slice(0, index).concat(array.slice(index + 1));
}

Array.prototype.remove = function (index) {
    return this.slice(0, index).concat(this.slice(index + 1));
}

//random 0 or 1:
Math.floor(Math.random()+0.5)

//shuffle:
Array.prototype.getShuffledCopy = function(){
    var copy = this.slice();
    return copy.sort(function(a,b) { return Math.floor(Math.random()+0.5) })
}

//function's arguments:
function sum() {
    var result = 0;
    for (var i = 0; i < arguments.length; i++) {
        var num = isNaN(Number(arguments[i])) ? 0 : Number(arguments[i]);
        result += num;
    }
    return result;
}