Variable define in JavaScript
There are four ways to declare variables in JavaScript:
- Automatically
- Using var
- Using let
- Using const
They are automatically keywords declared:
x = 5;
y = 6;
z = x + y;
They are var keywords declared:
var x = 5;
var y = 6;
var z = x + y;
They are let keywords declared:
let x = 5;
let y = 6;
let z = x + y;
They are const keywords declared:
const x = 5;
const y = 6;
const z = x + y;
They are Mixed keywords declared:
const price1 = 5;
const price2 = 6;
let total = price1 + price2;
Note: Mostly in trend let and const keywords were used in JavaScript which is added in 2015.
SetVarJavaScript.html
<html>
<body>
<script type="text/javascript">
var n=prompt("Enter age.........>");
var age = 15;
if( age > n )
{
document.write("<b>Qualifies for driving</b>");
}
else{
document.write("<b>Does not qualify for driving</b>");
}
</script>
<p>Set the variable to different value and then try...</p>
</body>
</html>
<body>
<script type="text/javascript">
var n=prompt("Enter age.........>");
var age = 15;
if( age > n )
{
document.write("<b>Qualifies for driving</b>");
}
else{
document.write("<b>Does not qualify for driving</b>");
}
</script>
<p>Set the variable to different value and then try...</p>
</body>
</html>
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