 # Final Value of Variable after Performing Operations Lab

Easy
1
25.0% Acceptance

In this lab, you will be working with a programming language that has only four operations and one single variable `X`. Your task is to determine the final value of the variable `X` after performing a list of operations. The operations and their effects are as follows:

• `++X` and `X++` will increment the value of the variable `X` by `1`.
• `--X` and `X--` will decrement the value of the variable `X` by `1`.

Initially, the value of `X` is `0`. You will be given an array of strings `operations` containing a list of operations that you need to perform. Your goal is to return the final value of `X` after performing all the operations.

## Examples

Let's take a quick look at some examples to better understand the problem.

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.

Example 2:

Input: operations = ["++X","++X","X++"]

Output: 3

Explanation: The operations are performed as follows:

• Initially, X = 0.
• `++X`: X is incremented by 1, X = 0 + 1 = 1.
• `++X`: X is incremented by 1, X = 1 + 1 = 2.
• `X++`: X is incremented by 1, X = 2 + 1 = 3.

Example 3:

Input: operations = ["X++","++X","--X","X--"]

Output: 0

Explanation: The operations are performed as follows:

• Initially, X = 0.
• `X++`: X is incremented by 1, X = 0 + 1 = 1.
• `++X`: X is incremented by 1, X = 1 + 1 = 2.
• `--X`: X is decremented by 1, X = 2 - 1 = 1.
• `X--`: X is decremented by 1, X = 1 - 1 = 0.

## Constraints

• `1 <= operations.length <= 100`
• `operations[i]` will be either `"++X"`, `"X++"`, `"--X"`, or `"X--"`.

Remember to export all the functions and variables you need to test in the evaluation script. Good luck!