Different ways of writing a function in JavaScript — Part I

Photo by Joan Gamell on Unsplash

In this post we are going to learn about functions in JavaScript and different ways of writing it.

Anatomy of a function

A simple function in JavaScript can written as follows:

function test() {
  console.log(‘hello world’);
}

Here ‘test’ represents the name of the function and the code inside { and } represents the body of the function. A function can be called by its name followed by ( and ). So to call the function above we write test();

Okay enough of the basics, lets dive into different ways a function can be declared in JavaScript and its uses.

‘typeof’ operator and function:

Though function is not a primitive data type, the ‘typeof’ operator returns a string “function” when you ask for its type. So

console.log(typeof test); // prints a string “function”

A quick puzzle for our readers. How do you print the contents of a user defined function in JavaScript? For example, I want to print the function test above along with the code inside it. How can I do it? Keep thinking and reading, I will tell you how

A function can be declared in the following ways in JavaScript

1. Function declaration