Nodejs Array Rotate roll()

Method Source Code

Array.prototype.roll = function() {
    var rand = randomNumber(this.length);
    var tem = [];
    for (var i = rand; i < this.length; i++) {
        tem.push(this[i]);//w  w  w  .j av  a 2s  .  c  o m
    }
    for (var i = 0; i < rand; i++) {
        tem.push(this[i]);
    }
    return tem;
}

Related

1. rotate( ()

   Array.prototype.rotate = (function () {
       var push = Array.prototype.push,
           splice = Array.prototype.splice;
       return function (count) {
           var len = this.length >>> 0,
               count = count >> 0;
           count = ((count % len) + len) % len;
           push.apply(this, splice.call(this, 0, count));
           return this;
   ...
   

2. rotate( dir )

   Array.prototype.rotate = function ( dir ) {
       var that = this,
           direction = dir !== "ccw",
           columns = that[0].length,
           flat = [],
           tmp = [];
       if ( !(that.length) || !columns ) {
           console.error("incompatible array lengths");
           return false;
   ...
   

3. rotate( n )

   Array.prototype.rotate = function( n ) {
     this.unshift.apply( this, this.splice( n, this.length ) )
     return this;
   

4. rotate(()

   Array.prototype.rotate = (function(){
     var unshift = Array.prototype.unshift,
     push=Array.prototype.push,
     splice=Array.prototype.splice;
     return function(count){
       var len=this.length >>>0,
       count = count >> 0;
       count = count % len;
       push.apply(this,splice.call(this,count,len));
   ...