Javascript Function

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by vsasikalabe dot icon Updated: Feb 24, 2023

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A function in JavaScript is a set of statements that executes a task or calculates a value, but sometimes, it should take some input and return an output. The function is declared const and can be on any object, const object, and non-const object. It needs to be initialized at the time of declaration whenever an object is declared as const. Here the function is multiplication. The number is passed to the function to perform multiplication. Functions in JavaScript can have 0 or more arguments. 

Function Invocation 

  • When "something" invokes (calls) the function, the code inside the function will execute: 
  • When an event occurs (a user clicks a button) 
  • When it is invoked (called) from code in Javascript. 
  • Automatically (self-invoked) 

JavaScript has four kinds of functions: 

  • Regular function: always runs to completion after the invocation and can return anything. 
  • Generator function: can be paused and resumed with the yield operator and returns a Generator object. 
  • Async function: can be paused and resumed with the await operator and returns a Promise. 
  • Async generator function: The await and yield operators can be used and return an AsyncGenerator object. 

Advantages of JavaScript functions: 

  • Code reusability: It saves coding. We can call a function several times. 
  • Less coding: It makes our program compact. To perform a common task, we do not need to write many lines of code each time. 

The syntax of declaring a function: 

function functionName([arg1, arg2, ...argN]){   

 //code to be executed.   


The return statement is required to return a value from a function. This statement takes place to the end of the statement in a function. 

Here is an example of how to create Javascript Functions: 

Preview of the output that you will get on running this code from your IDE.



Follow the steps carefully to get the output easily.

  1. Download and Install VS Code on your Desktop.
  2. Open the VS Code and install Javascript ES6 Code Snippet and Code Runner from Extensions.
  3. Open the new file and save as example.js.
  4. Click on the code topic and choose the answer code.
  5. Copy the code using the "Copy" button above, and paste it in your javascript file.
  6. Run the code using (ctr+alt+N) Run button.

I hope you found this useful. I have added version information in the following sections.

I found this code snippet by searching for ' Javascript Functions ' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in VS Code 1.73.1 version.
  2. JavaScript (ES6) code snippets v1.8.0
  3. Code Runner v0.11.8

Using this solution, we are able to use Java Script Functions with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to use Java Script Functions.


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