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website hosting website hosting 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. 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).

website hosting 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). Attempt to alter a frozen object, and Ruby will raise a TypeError exception.

website hosting 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 .ruby { background: #fff0f0 } .

website hosting header { color: white } .subheader { color: #ffdddd } .sidebar { width: 6in } .codebox { background: #f8e4e4; width: 100% } span.sans { font-family: sans-serif } Web Hosting Tips for Webmasters - Ruby Containers, Blocks, and Iterators A jukebox with one song is unlikely to be popular (except perhaps in some very, very scary bars), so pretty soon we'll have to start thinking about producing a catalog of available songs and a playlist of songs waiting to be played.

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