Postfix (x++)

Using it after the operand (x++)

let x = 3;
const y = x++;

console.log(x, y); // x:4, y:3

• Original variable is incremented
• New variable is assigned the original value before incrementing

Prefix (++x)

Using it before the operand (++x)

let a = 3;
const b = ++a;

console.log(a, b); // 4, 4

• Original variable and new variable are both incremented.