05. Three ways to print

Before we move on, let's look at the three ways we can print out some output. This will be helpful for you to use when trying to understand what is going on when your JavaScript is processes.

Writing out as an alert

An alert window is a small window popup. We can display text on it with the alert() command.

Writing onto document

To write onto our document (or within the browser), we use the document.write() function. We'll learn all about the document object in an upcoming lesson.

Writing out to console

Every browser has a JavaScript console. In Chrome, for example, you can access it by going to View, Developer, JavaScript console. To write out onto this console, use console.log().

Thus, we have three ways to output text:

alert("Hello world!");
document.write("Hello world!");
console.log("Hello world!");

As you go through this tutorial, it's important to try out what you learned on your own, and use one of the three ways to check your outputs.

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