JavaScript handys

x+'' //convert to string
+x   //convert to number
!!x  //convert to boolean

//generate short random string
Math.random().toString(36).slice(-5)

//generate random ports
((Math.random() + 1) / 2  * 65535).toString().slice(0, 5)

function shuffle(arr) {
    var brr = arr.concat(), temp; //make a copy of arr
    for (var i = 0, rp = 0, len = brr.length; i < len; i++) {
        rp = (Math.random() * len) | 0; //random position
        temp = brr[i]; brr[i] = brr[rp]; brr[rp] = temp;
    }
    return brr;
}

function range(start, end) {
    var arr = [], i = 0;
    while(start <= end) {
        arr[i++] = start++;
    }
    return arr;
}