Learning JavaScript Data Structures and Algorithms - Second Edition

Functions

Functions are very important when working with JavaScript. We will also use functions a lot in our examples.

The following code demonstrates the basic syntax of a function. It does not have arguments or the return statement:

function sayHello() { 
  console.log('Hello!'); 
} 

To call this code, we simply use the following call:

sayHello(); 

We can also pass arguments to a function. Arguments are variables with which a function is supposed to do something. The following code demonstrates how to use arguments with functions:

function output(text) { 
  console.log(text); 
} 

To use this function, we can use the following code:

output('Hello!'); 

You can use as many arguments as you like, as follows:

output('Hello!', 'Other text'); 

In this case, only the ...