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If-Else In Javascript

While creating any web based system it is very often that you have to execute certain code based on certain situations. A common scenario is validations in JavaScript – if the condition is satisfied then do this action else do some other actions.

To accomplish this task JavaScript has given if-else language construct. In this article we will talk about if-else. The basic syntax of if condition is

if (condition is true) {
	//	Execute the code
} else {
	// Execute other code
}

To elaborate it with example let me give you a simple code.

var age = 25;
if (age < 18) {
	alert("adolescent");
} else {
	alert("Adult");
}

Try It

The code is judging the person on the basis of age if the person is adolescent or adult.

But sometimes you may face the situation in which you have to put multiple conditions, in that case you can use if-else if

if (condition is true) {
	//	Execute the code
} else if (condition is true)
{
	// Execute this code
} else {
	// Execute this code
}

If we again consider the example about we can make it more smart

var age = 25;
if (age < 18) {
	alert("adolescent");
} else if (age > 18 && age < 50) {
	alert("Young");
} else {
	alert("Old");
}

Try It

So you have seen how if- else have made our life easier.

Posted By -	Karan Gupta

Posted On -	Monday, March 21, 2011

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