Variables and data types in JavaScript

by danielkwood

HTML

<html>
    <head>
        <title>Variables</title>
        <script src="script.js"></script>
    </head>

    <body>
        
    </body>
</html>

JavaScript

// Data types in JavaScript include:
// String - characters (letters, numbers, or symbols)
// Integer - whole numbers
// Float - floating point (decimal) numbers
// Boolean - true/false only

// These are examples of string variables:
var user = "Joe";
var greeting = "Hello there";

// This is an integer variable:
var score = 50;

// This is a float variable:
var average = 20.57;

// This is a boolean variable:
var finishedGame = false;

// Example of joining (concatenating) variables and strings together to display on screen
// You can use , or + to join variables or strings together
document.write(greeting + ", " + user + ". Your score is " + score , ". The average score is " + average);

// You can include HTML tags in string values:
document.write("<h1>Welcome, " + user + ".</h1>");

// Make sure you escape quotes within a string using the \ backslash character
document.write("Joe said \"hello\".");