Difference between x++ or ++x or x+=1 in JavaScript.

Question

Can anyone explain the difference in JavaScript between x++ and ++x and x+=1? I didn't find a good explanation yet..

Answer 1

x++ is a postfix increment and ++x is prefix. Here's an example. (Not good at JS) So I'll use C++, but you should understand it well.

int x = 6

cout << x++;
The output is 6 because you printed the variable and incremented after, later in the code it be 7 unless changed though.

int x = 6

cout << ++x;
The output is 7 because you incremented the variable before printing it.

Hope this help with ++x and x++, not sure how to answer x+=1 though.

Answer 2

Thank you for the explanation!

Answer 3

x+=1 is the same as x=x+1

++x; //prefix
x++; //postfix
Prefix increments the value, and then proceeds with the expression.
Postfix evaluates the expression and then performs the incrementing.

Answer 4

😀👍

Answer 5

@Ash Ketchum I don't believe c++ and js incorporate the pre decriment operator equally.

Answer 6

Interesting that I still use this question (and answers of course) as a reference :)

Answer 7

@Paul Np, happy to help 😁😁