concat() - FUNCTION

The concat() Function is used to join two Strings into one String.

Say, we have two Strings, Hello and World. And we want to join/concatenate them into one String, HelloWorld.

Let us solve it with the below example.

<html>
<body>  
<script>

	var x = "Hello"
	var y = "World"
    var z = x.concat(y)
	document.write(z)
    
</script>      
</body>
</html>

Output :

HelloWorld

So, we have stored the String Hello in x.

var x = "Hello"

And, stored the String World in y.

var y = "World"

And used the + operator to join/concatenate Hello and World.

var z = x.concat(y)

And store the concatenated value in z.

But we cannot use the concat() function to join/concatenate a number and a String.

i.e. The below code will result into an error.

<html>
<body>  
<script>

	var x = 5
	var y = "World"
    var z = x.concat(y)
	document.write(z)
    
</script>      
</body>
</html>