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A lot of languages require that you write some code, compile, and then run the program to see the results. However, Ruby is dynamic, which means that you can work with the language live. Ruby comes with a great little tool: an interactive interpreter. It s called irb (for Interactive Ruby). You can start up an irb session whenever you want by typing irb at the command prompt. Using irb, you can play around with code and make sure it works as you expect before you write it into your programs. You can execute any arbitrary Ruby code in irb and do anything you might otherwise do inside your Ruby programs: set variables, evaluate conditions, and inspect objects. The only essential difference between an interactive session and a regular old Ruby program is that irb will echo the return value of everything it executes. This saves you from having to explicitly print the results of an evaluation. Just run the code, and irb will print the result.
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APPENDIX A RUBY, A PROGRAMMER S BEST FRIEND
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You ll be able to tell whenever you re inside an irb session by looking for the double greater-than signs (>>), which indicate the irb prompt, and the arrow symbol (=>), which indicates the response. To start an irb session, just go to the command prompt and type irb. You should see the irb prompt waiting for your input.
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$ irb irb(main):001:0>
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Look at that. You re inside Ruby! If you press Enter, you ll see that it will just ignore the line and give you another prompt. It can only get more exciting from here. When learning a new programming language, traditionally, the first thing you ever do is make the language print the string Hello, World! In Ruby, you can print something out on the screen by using the puts command.
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>> puts "Hello, World!" Hello, World! => nil >> "Hello, World!" => "Hello, World!"
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The first example used the puts command to print Hello, World! to the console and returned nil, Ruby s way of expressing nothing. This is because the return value of the puts command is nil. In the second example, we just typed Hello, World! in quotes, without the puts. This creates a literal Ruby String object. True to form, irb prints the return value, which in this case is the string itself, Hello, World! .
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A data type is a constraint placed upon the interpretation of data. Numbers and strings are just two of the data types that the Ruby interpreter distinguishes between, and the way Ruby adds numbers is different from the way in which it adds strings. For example, 2 + 3 evaluates to 5, but, 2 + 3 evaluates to 23 . The second example might seem surprising at first, but it's really quite simple: numbers surrounded by quotes are interpreted as strings. Read on to find out more.
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Strings
A string is a sequence of characters that usually represents a word or some other form of text. In Ruby, you can create String objects by putting together the characters inside single or double quotation marks.
APPENDIX A RUBY, A PROGRAMMER S BEST FRIEND
>> "Ruby is a great language" => "Ruby is a great language" >> 'Rails is a great framework' => "Rails is a great framework"
The main difference between strings delimited by single and double quotes is that the latter is subject to substitutions. Those substitutions are identified by Ruby code inside the #{} construct, which will be evaluated and replaced by its result in the final String object.
>> "Now is #{Time.now}" => "Now is Sun Dec 10 22:12:55 GST 2006" >> 'Now is #{Time.now}' => "Now is \#{Time.now}"
When you use that hash symbol (#) with the curly braces, Ruby notices and tries to evaluate whatever is in between the braces. Evaluate means to process it like any other line of code. So, inside the braces, we say Time.now, which happens to return the current time. However, when you use single quotes, Ruby doesn t check the string for substitutions before sending it through. Remember that just typing out a string doesn t mean that the user will see it appear. You are just creating the string. If you want the user to see it (outside of irb), you need to add a puts to the front, as you saw in the previous section. The String class has a large number of methods you will probably need when doing string manipulation, like concatenation and case-changing operations. In the following examples, a few of those methods are listed.
>> "Toronto - Canada".downcase => "toronto - canada" >> "Dubai UAE".upcase => "DUBAI UAE" >> "a " + "few " + "strings " + "together" => "a few strings together" >> "HELLO".capitalize => "Hello"
To get a list of methods available for any object, just call the methods method using an instance of Tip
the object you want to inspect. Type "a string".methods in irb to see all the methods you can call on the String object.
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