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cheap private java application cheap private java application So, is a variable an object? In Ruby, the answer is ``no.'' A variable is simply a reference to an object. Objects float around in a big pool somewhere (the heap, most of the time) and are pointed to by variables. Let's make the example slightly more complicated. person1 = "Tim" person2 = person1 person1[0] = 'J' person1 » "Jim" person2 » "Jim" What happened here? We changed the first character of person1, but both person1 and person2changed from ``Tim'' to ``Jim.

cheap private java application '' It all comes back to the fact that variables hold references to objects, not the objects themselves. The assignment of person1 to person2 doesn't create any new objects; it simply copies person1's object reference to person2, so that both person1 and person2 refer to the same object. We show this in Figure 3.1 on page 31. Assignment aliases objects, potentially giving you multiple variables that reference the same object.

cheap private java application But can't this cause problems in your code? It can, but not as often as you'd think (objects in Java, for example, work exactly the same way). For instance, in the example in Figure 3.1, you could avoid aliasing by using the dup method of String, which creates a new String object with identical contents. person1 = "Tim" person2 = person1.dup person1[0] = "J" person1 » "Jim" person2 » "Tim" You can also prevent anyone from changing a particular object by freezing it (we talk more about freezing objects on page 251).

cheap private java application Attempt to alter a frozen object, and Ruby will raise a TypeError exception. person1 = "Tim" person2 = person1 person1.freeze       # prevent modifications to the object person2[0] = "J" produces: prog.rb:4:in `=': can't modify frozen string (TypeError) from prog.rb:4 .

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