Increment or Decrement Operators in JavaScript

The increment (++) and decrement (--) operators in JavaScript are used to increase or decrease the value of a variable by 1, respectively. They are unary operators, meaning they work on a single operand. The increment (++) and decrement (--) operators can be used in two forms: postfix and prefix. The difference lies in when the increment or decrement operation takes place in relation to the variable.

  • Postfix Increment / Decrement (x++ / x--)
    • The postfix increment (x++) and postfix decrement (x--) operators first return the original value of the variable and then increment or decrement the variable by 1.
  • Prefix Increment / Decrement (++x / --x)
    • The prefix increment (++x) and prefix decrement (--x) operators first increment or decrement the variable by 1 and then return the updated value.

Source Code

HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Tutor Joes</title>
</head>
<body>
 
	<script src="js/script.js"></script>
</body>
</html>
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script.js
// Increment (++) or Decrement (--)

let a=1;
a++; //a=a+1
console.log(a);

let b=5;
b--; //b=b-1;
console.log(b);

/*
PostFix Increment   a++
Prefix Increment   ++a
 */

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

console.log("X : ",x,"Y : ",y);


let i=3;
const j=++i;
console.log("I : ",i,"J : ",j);
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