Nodejs Array Rotate rotate( dir )

Method Source Code

Array.prototype.rotate = function ( dir ) {
    var that = this,
        direction = dir !== "ccw",
        columns = that[0].length,
        flat = [],/*from  w  w  w  . j a v a 2s . co m*/
        tmp = [];

    /* check if used array has proper structure */
    if ( !(that.length) || !columns ) {
        console.error("incompatible array lengths");
        return false;
    }

    /* flatten array entries */
    for ( var i = 0, l = that.length; i < l; i++ ) {
        for ( var j = 0, m = that[i].length; j < m; j++ ) {
            if (direction) {
                flat.push(that[i][j]);
            } else {
                flat.unshift(that[i][j]);
            }
        }
    }

    /* set up modified array structure */
    for ( var k = 0, n = flat.length; k < n; k++ ) {
        var index = k % columns;
        if ( !tmp[index] ) {
            tmp[index] = [flat[k]];
        } else {
            tmp[index].unshift(flat[k]);
        }
    }

    return tmp;
};

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( 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));
   ...
   

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];
   ...