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Introduction to JavaScript: First Steps

Introduction to Functions

Explore how to create and invoke functions in JavaScript. Learn why functions are essential to writing efficient code by reducing repetition. This lesson helps you understand function syntax, calling functions, and the value they add to programming.

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We now get to one of the topics that new programmers find most difficult. Once the understanding sinks in, however, it’ll feel trivial. You’ll write functions pretty much every single day that you write code.

Let’s show some code and then discuss what’s happening.

Node.js
function myFirstFunction() {
    console.log('Just ran my first function!');
}
myFirstFunction(); // -> Just ran my first function!

Creating a Function

To write a function, we start with the function keyword. We write the name we want to give the function ...

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