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

left-rotation.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
    
    var firstElem;
    var lastElem;
       
    for(i = 0; i < d; i++) {
        firstElem = a.shift();
        lastElem = a.push(firstElem);
    }
  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(" "));
}