Difference between p++ and ++p when using that in a for loop Javascript

Question

This could be a very naive dumb question, but what is the difference in the output of the following 2 condition:

for (var p=0; p<3; p++) {console.log(p)}
//outputs:
0
1
2


for (var p=0; p<3; ++p) {console.log(p)}
//outputs:
0
1
2

'p' result into same output regardless whether I increment the value first and then print it or vice vera. also I do understand the diff between (p++) and (++p), but in this case I'm unable to understand whether at this point in looping will it make it any difference if I were I do either of 2 or if it does make difference how would that impact my program.

Can someone please explain.

Thank

Answer 1

If you dont use the values, after using pre- and post-fix, there is absolutely no difference at all. (exept from performance)

Doing something like this would behave differently, as you can see:

var a = 0;
var b = 0;
var arr = [0,1,2];

console.log(arr[++b]);
console.log(arr[b++]);
console.log(arr[b]);

Answer 2

In this case there is no difference whatsoever as you are not using the value of the expression.