Nodejs Array Rotate rotate(n)

Method Source Code

Array.prototype.rotate = function(n) {
   this.unshift.apply(this, this.splice(n + 1, this.length))
   return this;//from   w ww .  jav a2s . co m
}

var arr = [1, 2, 3, 4, 5];
var arr1 = [1, 2, 3, 4, 5];

/*
* Implement a function rotateArray(vector<int> arr, int r) 
which rotates the array by r places. Eg 1 2 3 4 5 on being rotated by 2 gives 4 5 1 2 3.
*/
var rotate = function(arr, r) {
   arr.unshift.apply(arr, arr.splice(r + 1, arr.length));
};

rotate(arr, 2);
console.log(arr);
// arr1.rotate(2);
// console.log(arr1);

Related

1. 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));
   ...
   

2. 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;
   ...
   

3. 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];
   ...
   

4. 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;
   ...
   

5. 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;
     };
   ...
   

6. rotate(n)

   var a =  (function() { var a = []; for (var i = 0; i < 35; i++) { a.push(i) }; return a; }())
   Array.prototype.rotate = function(n) {
     var a = this.concat(this.splice(0, n))
     return a
   a.rotate(12)
   function findI(arr, i) {
     if (arr.length == 2) { return i+1 }
     var k = (arr.length/2).floor(), i = i || 0
   ...
   

7. rotate(times)

   Array.prototype.rotate = function(times) {
     if (times < 0) {
       var last = arr.pop
       return arr.unshift(last)
   function solution (numbers, times) {
     for (var i = 0; i < times; i++) {
       numbers.rotate
   ...
   

8. rotateArray(n)

   Array.prototype.rotateArray = function (n) {
       let firstArray = [];
       let secondArray = [];
       for (let i = this.length - 1; i > this.length - n - 1; i--) {
           firstArray.unshift(this[i]);
       for (let j = 0; j < this.length - n; j++) {
           secondArray[secondArray.length] = this[j];
       return firstArray.concat(secondArray);
   function createArray() {
       let valuesStr = prompt("Enter an Array : ");
       let arrayStr = valuesStr.split(" ");
       let array = [];
       for (let i = 0; i < arrayStr.length; i++) {
           if (arrayStr[i] )
           array[array.length] = Number(arrayStr[i]);
       return array;
   let array = createArray();
   console.log(array.rotateArray(3));
   

9. rotate_copy(begin, middle, end)

   Array.prototype.rotate_copy = function (begin, middle, end) {
     var back = this.slice (begin, middle - begin);
     back.unshift (0);
     back.unshift (end - middle);
     var front = this.slice (middle, end);
     front.splice.apply (front, back);
     return front;
   };