Variables
Variables in JavaScript, as in most languages, can be thought of as named “buckets” that associate names with data that can be used in a program. Information for different variables is stored in memory, which allows you to access that information with a name that points to those data in memory. For example, if you were writing a program that would convert degrees in Fahrenheit to degrees in Celsius, you might store the degrees in a variable in order to do multiple calculations on it.
Listing 2–2. Simple JavaScript Variables
var degrees = 51;
var celsius = (degrees - 32) * 5 / 9;
console.log(degrees);
console.log(degrees * 2);
console.log(celsius);
Figure 2–6. Firebug variables
JavaScript variables must begin with a letter, ...
Get Beginning Facebook Game Apps Development now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
