JavaScript If...Else Statements

JavaScript If...Else Statements

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Conditional statements are used to perform different actions based on different conditions.


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Conditional Statements
Very often when you write code, you want to perform different actions for different decisions. You can use conditional statements in your code to do this.

In JavaScript we have the following conditional statements:

•if statement - use this statement to execute some code only if a specified condition is true
•if...else statement - use this statement to execute some code if the condition is true and another code if the condition is false
•if...else if....else statement - use this statement to select one of many blocks of code to be executed
•switch statement - use this statement to select one of many blocks of code to be executed

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If Statement
Use the if statement to execute some code only if a specified condition is true.

Syntax
if (condition)
{
code to be executed if condition is true
}

Note that if is written in lowercase letters. Using uppercase letters (IF) will generate a JavaScript error!