++first it must decrease before it increases

I'm attempting to create a basic counter feature, where clicking on a button labelled "+" should increase a variable named Score by 1, and the "-" button should decrease it by 1. However, I've encountered an issue where pressing the "+" button for the first time actually decreases the score by one before increasing it on the second click, and the same applies for the "-". Can anyone identify what I'm doing incorrectly here?

Just to note, I'm coding for enjoyment and am fairly new to Stack Overflow, so please excuse any messy code in my implementation.

<!DOCTYPE html>
<html>

<p id="Score1">
    
</p>
    
<p id="Score2">
    
</p>

    
    <button type: button onclick= PlusOneTeam1()>
        +
    </button>
    
    <button type: button onclick="MinusOneTeam1()">
        -
    </button>
    
    <button type: button onclick="PlusOneTeam1">
        +
    </button>
    
    <button type: button onclick="MinusOneTeam2">
        -
    </button>

<script>
    
    var Score = 0
    
    document.getElementById("Score1").innerHTML = Score

function PlusOneTeam1() {
    document.getElementById("Score1").innerHTML = Score ++  ; 
    return Score ;
}

    
function MinusOneTeam1() {
    document.getElementById("Score1").innerHTML = Score -- ;
}
</script>
    
    
</html>

Answer №1

It might be necessary to utilize += 1 or ++a in this situation.

According to the provided documentation:

The increment operator adds one to its operand and returns a value.

If used postfix, with the operator after the operand (e.g., x++), it returns the value before incrementing. If used as a prefix with the operator before the operand (e.g., ++x), it returns the value after incrementing.

Let's examine some code:

let a = 1
let b = a++

console.log(a, b) // a is 2, b is 1

In the above scenario, a++ returns the current value of a, and then increments a.

let a = 1
let b = ++a

console.log(a, b) // 2, 2

In this case, both values are 2 because ++a first increments a and then uses the updated value in the expression.

Explore more on Increment Operator from Mozilla Developer Network

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