2011. Final Value of Variable After Performing Operations | LeetCode Solution | JavaScript | Easy

LeetCode Problem - Link

Problem

There is a programming language with only four operations and one variable X:

• ++X and X++ increments the value of the variable X by 1.
• --X and X-- decrements the value of the variable X by 1.

Initially, the value of X is 0.

Given an array of strings operations containing a list of operations, return the final value of X after performing all the operations.

Example 1:

Input: operations = ["--X","X++","X++"]
Output: 1
Explanation: The operations are performed as follows:
Initially, X = 0.
--X: X is decremented by 1, X =  0 - 1 = -1.
X++: X is incremented by 1, X = -1 + 1 =  0.
X++: X is incremented by 1, X =  0 + 1 =  1.

 Sequential Approach

Straight forward approach, check for increment operations, increase counter if yes, decrease if not

/**
 * @param {string[]} operations
 * @return {number}
 */
var finalValueAfterOperations = function(operations) {
    var count = 0;
    for(var i=0;i<operations.length;i++){
        if(operations[i] === "--X" || operations[i]==="X--"){
            count -= 1
        }else{
            count+=1
        }
    }
    return count
};