What is the difference between i++ and ++i in JavaScript?

i++

• known as post-increment
• it first returns the original value of i then increments it by 1

for example:

let i = 1, j;

j = i++;
console.log(i, j); //2 1

First, the value of i is assigned to j then i is incremented by 1. Hence, i is 2 and j is 1.

++i

• known as pre-increment
• it first increments the value of i by 1 then returns it.

for example:

let i = 1, j;

j = ++i;
console.log(i, j); //2 2

first, the value of i is incremented by 1 and then assigned to j. Hence, i is 2 and so is j.