In this blog post, we will be discussing how to write a function in JavaScript. Functions are a vital part of any programming language and they allow you to reuse code.
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Introduction
A function is a block of code that performs a specific task. Functions are often “called” or “invoked” when they are needed.
When you define a function, you can optionally specify one or more parameters. Parameters are like variables that are used to store values that will be used inside the function.
Functions can return a value back to the code that invoked them. This is useful if you need to perform a task and then use the result of that task elsewhere in your code.
In JavaScript, functions are objects. This means that they can be passed as arguments to other functions, and they can be returned from functions as well. Functions can also be assigned to variables and properties of other objects.
What is a function?
In JavaScript, a function is a block of code that is executed when an event is triggered. Functions can be defined in two ways:
1) Via the function keyword:
function myFunction() {
// code to be executed goes here
}
2) As a function expression:
var myFunction = function() {
// code to be executed goes here
};
How to write a function
In JavaScript, a function is a block of code that is designed to perform a specific task. Functions are always written with the keyword function:
function myFunction() {
// code to be executed
}
Calling a function
When you call a function, you simply type its name followed by parentheses (). Doing so will execute the code inside the function. For example, let’s take the following function:
function alertHelloWorld() {
alert(“Hello world!”);
}
To call this function, all you need to do is type its name followed by parentheses, like this:
alertHelloWorld();
This will cause the message “Hello world!” to appear in an alert box on your screen.
Conclusion
A function is a block of code that takes an input, does something with it, and then gives an output. You can use functions to make your code more modular and easy to read. In this article, we saw how to write functions in JavaScript, how to call them, and how to use them with different data types. We also covered some of the built-in functions that are available in JavaScript. Now you have all the tools you need to write your own functions!
