++someVariable vs. someVariable++ in JavaScript

Question

In JavaScript you can use ++ operator before (pre-increment) or after the variable name (post-increment). What, if any, are the differences b

Answer 1

I've an explanation of understanding post-increment and pre-increment. So I'm putting it here.

Lets assign 0 to x

let x = 0;

Lets start with post-increment

console.log(x++); // Outputs 0

Why?

Lets break the x++ expression down

x = x;
x = x + 1;

First statement returns the value of x which is 0

And later when you use x variable anywhere, then the second statement is executed

Second statement returns the value of this x + 1 expression which is (0 + 1) = 1

Keep in mind the value of x at this state which is 1

Now lets start with pre-increment

console.log(++x); // Outputs 2

Why?

Lets break the ++x expression down

x = x + 1;
x = x;

First statement returns the value of this x + 1 expression which is (1 + 1) = 2

Second statement returns the value of x which is 2 so x = 2 thus it returns 2

Hope this would help you understand what post-increment and pre-increment are!