Download e-book for kindle: Eloquent Ruby by Olson

By Olson

ISBN-10: 0321584104

ISBN-13: 9780321584106

It’s effortless to put in writing “correct” Ruby code. yet it’s a ways tougher to realize the fluency had to write nice Ruby code. to do this, you want to transcend syntax and soak up the “Ruby method” of considering and challenge fixing. In Eloquent Ruby, Russ Olsen is helping you know Ruby like real Rubyists do—so you could leverage its large, fantastic energy. Olsen attracts on years of expertise internalizing the Ruby tradition and educating Ruby to different programmers. He publications you to the “Ah Ha!” moments while it all of sudden turns into transparent why Ruby works how it does and the way you could reap the benefits of its special approach. Eloquent Ruby starts off small, answering tactical questions inquisitive about a unmarried assertion, approach, attempt, or computer virus. You’ll how to write code that really seems like Ruby (not Java) why Ruby has such a lot of regulate buildings how one can use strings, expressions, and logos and what dynamic typing is basically strong for.

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Sample text

Remember, the Ruby convention is that an exclamation point at the end of a method name indicates that the method is the dangerous or surprising version of a pair of methods. Since making a modified copy of a collection seems very safe while changing a collection in place can be a bit dicey, we have sort and sort!. -less methods in Ruby’s collection classes, methods that will cheerfully change your collection in place as an intrinsic part of what they do.

Sorts the array in place. Don’t, however, get the idea that only methods with names ending in ! will change your collection. Remember, the Ruby convention is that an exclamation point at the end of a method name indicates that the method is the dangerous or surprising version of a pair of methods. Since making a modified copy of a collection seems very safe while changing a collection in place can be a bit dicey, we have sort and sort!. -less methods in Ruby’s collection classes, methods that will cheerfully change your collection in place as an intrinsic part of what they do.

After all, the value of flag may have been the result of a call to defined?. The idea behind defined? ( doc ) The rub is that although defined? does indeed return a boolean, it never, ever returns true or false. Instead, defined? ( doc ) will return "local-variable". On the other hand, if the thing passed to defined? is not defined, then defined? will return nil. —like many Ruby methods—works in a boolean context, as long as you don’t explicitly ask if it returns true or false. It’s also possible to go wrong by taking nil for granted.

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Eloquent Ruby by Olson


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