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Learning can be a fun activity in its own right, but merely reading about something won t make you an expert at it. I ve read a few cookbooks, but this doesn t seem to improve my cooking when I attempt it from time to time. The missing ingredient is experimentation and testing, as without these your efforts are academic, at best. With this in mind, it s essential to get into the mood of experimenting and testing from day one of using Ruby. Throughout the book I ll ask you to try out different blocks of code and to play with them to see if you get the results you want. You ll occasionally surprise yourself, sometimes chase your code into dead ends, and often want to pull out your hair (if you have any, of course!). Whatever happens, all good programmers learn from experimentation, and you can only master a language and programming concepts by experimenting as you go along. Trust me, it s fun! This book will lead you through a forest of code and concepts, but without testing and proving the code is correct to yourself, you can quickly become lost. Use irb and the
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CHAPTER 2 PROGRAMMING == JOY: A WHISTLE-STOP TOUR OF RUBY AND OBJECT ORIENTATION
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other tools I ll cover frequently and experiment with the code as much as possible so that the knowledge will stick. Type in the following code at your irb prompt and press Enter:
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print "test"
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The result is, simply:
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test => nil
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Logically, print "test" results in test being printed to the screen. However, the second line is the result of your code as an expression (more about these in 3). This is because almost everything in Ruby is an expression. However, print displays data to the screen rather than return any value as an expression, so you get nil. More about this in 3. Let s try something else:
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print "2+2 is equal to" + 2 + 2
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This command seems logical on the surface. If 2 + 2 is equal to 4 and you re adding that to the end of "2+2 is equal to", you should get "2+2 is equal to 4", right Unfortunately, you get this error instead:
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TypeError: can't convert Fixnum into String from (irb):45:in `+' from (irb):45 from :0
Ruby complains when you make an error, and here it s complaining that you can t convert a number into a string (where a string is a collection of text, such as this very sentence). Numbers and strings can t be mixed in this way. Deciphering the reason isn t important yet, but experiments such as this along the way will help you learn and remember more about Ruby than reading this book alone. When an error like this occurs, you can use the error message as a clue to the solution, whether you find it in this book, on the Internet, or by asking another developer. An interim solution to the preceding problem would be to do this:
print "2+2 is equal to " print 2 + 2
CHAPTER 2 PROGRAMMING == JOY: A WHISTLE-STOP TOUR OF RUBY AND OBJECT ORIENTATION
Or this:
print "2+2 is equal to ", 2 + 2
Let s try one more example. What about 10 divided by 3
irb(main):002:0> 10 / 3 => 3
Computers are supposed to be precise, but anyone with basic arithmetic skills will know that 10 divided by 3 is 3.33 recurring, rather than 3! The reason for the curious result is that, by default, Ruby assumes a number such as 10 or 3 to be an integer a whole number. Arithmetic with integers in Ruby gives integer results, so it s necessary to provide Ruby with a floating point number (a number with decimal places) to get a floating point answer such as 3.33. Here s an example of how to do that:
Irb(main):001:0> 10.0 / 3 => 3.3333333333333
Unobvious outcomes such as these make testing not only a good learning tool, but an essential process in larger programs. That s enough of the errors for now though. Let s make something useful!
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