Final Value of Variable After Performing Operations solution leetcode

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There is a programming language with only four operations and one variable X
:
++X
andX++
increments the value of the variableX
by1
.X
andX
decrements the value of the variableX
by1
.
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.
Final Value of Variable After Performing Operations solution leetcode
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.
Final Value of Variable After Performing Operations solution leetcode
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.
Final Value of Variable After Performing Operations solution leetcode
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.
Final Value of Variable After Performing Operations solution leetcode
1 <= operations.length <= 100
operations[i]
will be either"++X"
,"X++"
,"X"
, or"X"
.
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