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What is if statement in JavaScript?

The if statement is the fundamental control statement that allows JavaScript to make decisions and execute statements conditionally. 

Syntax

The syntax for a basic if statement is as follows −

if(expression){
   Statement(s)to be executed if expression is true
}

Here a JavaScript expression is evaluated. If the resulting value is true, the given statement(s) are executed. If the expression is false, then no statement would be not executed. Most of the times, you will use comparison operators while making decisions.

Example

You can try to run the following to learn how to work with if statement in JavaScript −

Live Demo

<html>
   <body>
      <script>
         var age = 25;
         if( age > 18 ){
            document.write("Eligible to vote!");
         }
      </script>
      <p>Set the variable to different value and then try...</p>
   </body>
</html>
Updated on 13-Jun-2020 11:37:20

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