Instance Variables

Learn to Program — by Chris Pine (78 / 105)

👈 Creating Classes | TOC | new vs. initialize 👉

Normally when we want to talk about a string, we will just call it a string. However, we could also call it a string object. Sometimes programmers might call it an instance of the class String, but it’s just another way of saying string. An instance of a class is just an object of that class.

So, instance variables are just an object’s variables. A method’s local variables last until the method is finished. An object’s instance variables, on the other hand, will last as long as the object does. To tell instance variables from local variables, they have @ in front of their names:

Hmmm…well, at least it didn’t give us an error. Still, it doesn’t really make sense for a die to be “unrolled,” or whatever nil is supposed to mean here. It would be nice if we could set up our new Die object right when it’s created. That’s what initialize is for; as soon as an object is created, initialize is automatically called on it:

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