Variables in JavaScript

Here is an example of a variable:

<!DOCTYPE html>
  <title>My Page</title>

var greeting = "Hello";


Here's what the page does:

a web page with an alert dialog showing


var greeting = "Hello!";

stores the text Hello! into a variable named greeting. The semicolon ; is used to indicate the end of a statement (instruction).

This line:


uses a function to show the user a message. We'll learn about functions later.

So what exactly is a variable?

A variable is a way to store a value (number, text, etc.). The reason we store values is to help us do things with those values.

Analogy: People have names, and those names are used when you want to refer to a specific person. A variable is a way to give a name to a value, so you can refer to it later.

What do variables store?

Variables can store strings (text):

var firstname = "Bob";

or numbers:

var numPeople = 3;

or objects:

var fruits = ['banana', 'pineapple', 'peach', 'strawberry'];

Next: JavaScript Functions


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