Table of Contents
JavaScript Functions
In JavaScript, you write all your logic within a function. A function is a block of code designed to perform a specific task. After performing its task, the function returns a result. To execute a function, we need to trigger it. In this section, we will learn how to write a function, how to trigger a function and how to get a result from that function.
JavaScript Function Syntax
A JavaScript function starts with a keyword function, it is followed by the function name and parentheses ( ). The code that needs to be executed is written within curly brackets { }.
function add(a, b){ return a + b; }
This function has two parameters a and b, known as arguments of a function. The values of these parameters will be provided while calling this function. In return, this function will produce sum of these parameters.
Triggering a JavaScript Function
A JavaScript function is triggered in the following three ways:
- When an event occurs i.e. when a user clicks a button
- The function is called by another JavaScript function
- Automatically (self-invoked) [In case, function is triggered by JavaScript events]
JavaScript Function Return
The JavaScript return statement is used to return the result of a function. This is mainly used whenever the function is called from another function or variable.
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