Javascript ++ Operator Priority

Question

I'm wondering what the priority of the ++ operator is when being called through a recursive function like so.

var count = 0;
function recur(x){
    if(x == 10)
        return x;
    else
        return recur(x++);
}

recur(count);

In the code, when return recur(x++) is being called, is x passing to the recur method as x, or as x+1? And what is the difference between x++ and ++x?

Thanks.

Instead of asking someone what value is passed, why not see for yourself what is passed? `console.log(x);` — cookie monster, Jan 21 '14 at 16:45

score 2 · Accepted Answer · answered Jan 21 '14 at 16:40

With return recur(x++), it will return the first value and then will increase. return recur(++x) does exactly the opposite, value first increases and then returns. This is the difference x++, first run the command after increments, and ++x first increases then run the command.

score 1 · Answer 2 · answered Jan 21 '14 at 16:42

1

Well the difference between x++ vr. ++x is:

var x = 5, y = 5;

console.log(++x); // outputs 6
console.log(x); // outputs 6

console.log(y++); // outputs 5
console.log(y); // outputs 6

So for ++x increments the variable inmediately.

answered Jan 21 '14 at 16:42

adielhercules

182
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Javascript ++ Operator Priority

2 Answers2