Left Rotation Array

   Left Rotation:

A left rotation operation on an array 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 . Note that the lowest index item moves to the highest index in a rotation. This is called a circular array.

Given an array  of  integers and a number, , perform  left rotations on the array. Return the updated array to be printed as a single line of space-separated integers.

Function Description

Complete the function rotLeft in the editor below.

rotLeft has the following parameter(s):

• int a[n]: the array to rotate
• int d: the number of rotations

Returns

• int a'[n]: the rotated array

Input Format

The first line contains two space-separated integers  and , the size of  and the number of left rotations.
The second line contains  space-separated integers, each an .

Constraints

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:

function rotLeft(a, d) {

    for(let i=0;i<d;i++){

        let lastElement=a[a.length-1];

        for(let j=0;j<a.length-1;j++){

            let updatedIndex=(j+a.length-1)%(a.length);

            a[updatedIndex]=a[j];

        }

         a[a.length-2]=lastElement;

    }

    return a;

}

   //OR

function rotLeft(a, d) {

    if(d==a.length)

        return a;

    else if(d>a.length)

        d=d%a.length;

      let newArr= a.splice(d,a.length)

     newArr= newArr.concat(a);

    return newArr;

}

 

Interview Programs

        //input user_name_Km outout userNameKm

    function getVariableName(inp) {

        let output = '';

        if (inp.indexOf('_') != -1) {

            var splitArr = inp.split("_");

            let i = 1;

            if (splitArr[0] === '') {

                i = 2;

                output += splitArr[1].toLowerCase();

            }

            else

                output += splitArr[0].toLowerCase();

            for (let j = i; j < splitArr.length; j++) {

                console.log(splitArr[j], splitArr[j].slice(1, splitArr[j].length));

                output += splitArr[j][0].toUpperCase() + splitArr[j].slice(1, splitArr[j].length);

            }

            return console.log(inp, output);

        }

        for (let i = 0; i < inp.length; i++) {

            console.log(inp[i].charCodeAt(), inp[i]);

            if (inp[i].charCodeAt() <= 90)

                output += '_' + inp[i].toUpperCase();

            else output += inp[i];

        }

        console.log(inp, output);

    }

    getVariableName("user_name_Km");

    getVariableName("_Nname_Km");

    getVariableName("Nname_jm_U");

    getVariableName("useUameKm");

    getVariableName("userName");

    getVariableName("YnameJmU");

    //Binary to Decimal

    var binary = "1101000";

    binaryToDecimal(binary)

    var digit = parseInt(binary, 2);

    console.log(digit);

    function binaryToDecimal(string) {

        let decimal = 0;

        let bits = 1;

        for(let i = string.length-1; i >=0; i--) {

            let currNum = (string[i]);

            console.log(currNum,"currNum")

            if(currNum === "1") {

                decimal += bits;

            }

            

            bits *= 2;

            console.log(bits,"bits",decimal)

        }

        console.log(decimal);

    }