JavaScript Multiple Values

The basic data types have been dealt with in the previous chapter. Now it's time to look at a slightly more complicated topic: arrays and objects. In the previous chapter, you saw variables that held just a single value. To allow for more complex programming, objects and arrays can contain multiple values.

You can look at objects as a collection of properties and methods. Properties can be thought of as variables. They can be simple data structures such as numbers and strings, but also other objects. Methods perform actions; they contain a certain number of lines of code that will be executed when the method gets called. We'll explain methods in more detail later in this book and focus on properties for now. An example of an object can be a real-life object, for example, a dog. It has properties, such as name, weight, color, and breed.

We will also discuss arrays. An array is a type of object, which allows you to store multiple values....