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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 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: print "test" The result is, simply: test=> nil Logically, print "test" results in test being printed to the screen However, the =>nil suffix is the result of your code as an expression (more about these in 3) This appears because all lines of code in Ruby are made up of expressions that return things.

However, print displays data to the screen rather than return any value as an expression, so you get nil More about this in 3 It is perfectly OK to be semi-confused about this at this stage Let s try something else: print "2+2 is equal to" + 2 + 2 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: TypeError: can't convert Fixnum into String from (irb):45:in `+' from (irb):45 from :0.

There are no restrictions on the kinds of values that can be defined for an entity. For example, you could have an entity with an Integer8 value, a list value, and another Integer8 value, as shown in Figure 5-4.

1. Fire up the application by pressing F5. If all goes well, you should see the application. 2. Highlight Dir1 in the Directories list box and click the Open Directory button. The

Ch apt er 2 n p r OG r a MMING == J OY: a WhI S t Le - S t O p t O U r O F r U B Y a N D O B Je C t O r I e N t a t I O N

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 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!

Part of the artistry of programming is in being able to turn your ideas into computer programs. Once you become proficient with a programming language, you can turn your ideas directly into code. However, before you can do this, you need to see how Ruby understands real-world concepts itself, and how you can relay your ideas into a form that Ruby appreciates.