1.Var
- Function-scoped (not block-scoped)
- Can be redeclared and updated
- Not recommended for modern code
Example:
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Variables</h1>
<p>In this example, x, y, and z are variables.</p>
<p id=”demo”></p>
<script>
var x = 5;
var y = 6;
var z = x + y;
document.getElementById(“demo”).innerHTML =”The value of z is: ” + z;
</script>
</body>
</html>
Output
JavaScript Variables
In this example, x, y, and z are variables.
The value of z is: 11
2. Let
- Block-scoped
- Cannot be redeclared in the same scope
- Can be updated
Example :
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Variables</h1>
<p>In this example, x, y, and z are variables.</p>
<p id=”demo”></p>
<script>
let x = 5;
let y = 6;
let z = x + y;
document.getElementById(“demo”).innerHTML =
“The value of z is: ” + z;
</script>
</body>
</html>
Output
JavaScript Variables
In this example, x, y, and z are variables.
The value of z is: 11
3. Const
- Block-scoped
- Cannot be redeclared or reassigned
- Must be initialized when declared
Example:
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Variables</h1>
<p>In this example, price1, price2, and total are variables.</p>
<p id=”demo”></p>
<script>
const price1 = 5;
const price2 = 6;
let total = price1 + price2;
document.getElementById(“demo”).innerHTML =
“The total is: ” + total;
</script>
</body>
</html>
Output
JavaScript Variables
In this example, price1, price2, and total are variables.
The total is: 11
Description :
In JavaScript, a variable is a container for storing data values. Variables allow you to store and manipulate data in your program. Each variable is given a name (known as the identifier) and a value.
Variables can store different types of data, such as numbers, strings, objects, or even more complex structures like arrays and functions.
