Nodejs Array Rotate rotate(()

Method Source Code

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;//from   w w  w .  j a  v  a2s. c  om
      count = count % len;
      
      push.apply(this,splice.call(this,count,len));
      // console.log(count%len, splice.call(this,count%len,len), this);
      // unshift.apply(this,splice.call(this,count%len,len));
      
      return this;
   };
})();

var arr=[1,2,3,4,5];
arr.rotate(-2);
console.log(arr);

Related

1. roll()

   Array.prototype.roll = function() {
       var rand = randomNumber(this.length);
       var tem = [];
       for (var i = rand; i < this.length; i++) {
           tem.push(this[i]);
       for (var i = 0; i < rand; i++) {
           tem.push(this[i]);
       return tem;
   

2. 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;
   ...
   

3. 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;
   ...
   

4. rotate( n )

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

5. rotate(()

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

6. rotate(()

   export function zeroOrOne() {
     return Math.round(Math.random() * 1)
   export function arrayShuffle(a) {
     let j, x, i;
     for (i = a.length; i; i -= 1) {
       j = Math.floor(Math.random() * i);
       x = a[i - 1];
       a[i - 1] = a[j];
   ...
   

7. rotate(K)

   Array.prototype.rotate = function (K){
     var N = this.length;
     if( N  < 1 || K < 1 || K > N ){
       return this;
     this.reverse(0, N - K - 1);
     this.reverse(N-K, N-1);
     this.reverse();
     return this;
   ...
   

8. rotate(count)

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