Why increment not saves in conditional operator?

Question

I wonder why in this code counter is not saving after it is incremented? I mean now the behavior is the same as if I used if (counter+1 % 2). But ++ operator supposed to permanently increment the variable.

let counter=0;
for (let i = 0; i < 10; i++) {
    console.log(counter,'every')
    if (counter++ % 2) console.log(counter,'odd');
}

Why do you think it's not saving? The counter is increasing. — Barmar, Jul 11 '19 at 16:51
You're testing the old value with `%`, not the incremented value. — Barmar, Jul 11 '19 at 16:51

score 3 · Answer 1 · answered Jul 11 '19 at 16:50

3

I believe you want to have ++ in front of counter

let counter=0;
for (let i = 0; i < 10; i++) {
    console.log(counter,'every')
    if (++counter % 2) console.log(counter,'odd');
}

answered Jul 11 '19 at 16:50

depperm

10,606
4
43
67

1

See also: [Arithmetic operators](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Examples_7) – esqew Jul 11 '19 at 16:51

score -1 · Answer 2 · answered Jul 11 '19 at 16:51

-1

If you use the ++ operator after the variable it will only increment after the line code is executed, if you put it behind the variable it will increment before the line code.

answered Jul 11 '19 at 16:51

João Pedro Sousa

122
9

Why increment not saves in conditional operator?

2 Answers2