Left Rotation of an array from https://www.hackerrank.com/challenges/array-left-rotation/problem

leftRotateAnArray.js

process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function leftRotation(a, d) {
    // Complete this function
    for(xcv=0;xcv<d;xcv++){
        a.push(a.shift());
    }
    return a;
}

function main() {
    var n_temp = readLine().split(' ');
    var n = parseInt(n_temp[0]);
    var d = parseInt(n_temp[1]);
    a = readLine().split(' ');
    a = a.map(Number);
    var result = leftRotation(a, d);
    console.log(result.join(" "));



}

A left rotation operation on an array of size shifts each of the array's elements unit to the left. For example, if left rotations are performed on array , then the array would become .

Given an array of integers and a number, , perform left rotations on the array. Then print the updated array as a single line of space-separated integers.

Input Format

The first line contains two space-separated integers denoting the respective values of (the number of integers) and (the number of left rotations you must perform).
The second line contains space-separated integers describing the respective elements of the array's initial state.

Constraints

Output Format

Print a single line of space-separated integers denoting the final state of the array after performing left rotations.

Sample Input

5 4
1 2 3 4 5
Sample Output

5 1 2 3 4
Explanation

When we perform left rotations, the array undergoes the following sequence of changes:

Thus, we print the array's final state as a single line of space-separated values, which is 5 1 2 3 4.