Programming Technology World: JavaScript Functions

A JavaScript function is a block of code to perform a specific task.

JavaScript Function Syntax

A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses ().

Function names can contain letters, digits and underscores.

A User-defined function name should be unique.

The parentheses may include parameter names separated by commas:
(parameter1, parameter2, ...)

The code to be executed by the function, code is placed inside curly brackets: {}

Syntax :


function function_Name(Parameter1, Parameter2, Parameter3) {

  // code to be executed

}

In Function Return Statement, the function will stop further execution code and return the main execution code.

Example :

Calculate the total price of the product, and return the result


var result = cal(10, 20);   // Function is called, number of product and price of product pass as parameters

function cal(a, b) {

  return a * b;             // Function returns the product of a and b Multiplied value

}

TUTORIAL


<html>

<body>

<p id="result"></p>

 
<script>

var result = cal(10, 20);   // Function is called, number of product and price of product pass as parameters

function cal(a, b) {

  return a * b;             // Function returns the product of a and b Multiplied value

}

document.getElementById("result").innerHTML = result;

</script> 
</body>
</html>

JavaScript Functions

3 comments: