Download Ruby In A Nutshell by Yukihiro Matsumoto PDF

By Yukihiro Matsumoto

Ruby is a fully natural object-oriented scripting language written in C and designed with Perl and Python features in brain. whereas its roots are in Japan, Ruby is slowly yet definitely gaining flooring within the united states The target of Yukihiro Matsumoto, writer of Ruby and writer of this booklet, is to include the strengths of alternative languages like Perl, Python, Lisp, and Smalltalk. Ruby in a Nutshell is a pragmatic reference consultant to the gains of Ruby, together with the command line ideas, syntax, outfitted- in variables, services, and plenty of everyday sessions and modules. The publication covers the present reliable model of Ruby (1.6), but is appropriate to the advance model 1.7 and the following deliberate solid model 1.8. The Ruby language syntax is carefully mentioned, besides the center performance equipped into the traditional Ruby interpreter, the integrated library, and the instruments that include Ruby, together with the debugger, profiler, and irb (or interactive ruby.)

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5 Mix-ins Properties (methods and constants) defined by a module can be added to a class or another module with the include method. They can also be added to a specific object using the extend method. 1. , without the receiver specified) Method visibility is defined using the public, private, and protected methods in classes and modules. ]) Makes the method specified by symbol public. The method must have been previously defined. If no arguments are specified, the visibility of all subsequently defined methods in the class or module is made public.

Class statements introduce a new scope for local variables. 2 Methods Class methods are defined with the def statement. The def statement adds a method to the innermost class or module definition surrounding the def statement. A def statement outside a class or module definition (at the top level) adds a method to the Object class itself, thus defining a method that can be referenced anywhere in the program. When a method is called, Ruby searches for it in a number of places in the following order: 1.

After receiver can be replaced by two colons (::). They work the same way, but :: is often used for class methods. A restriction in the implementation of Ruby prevents the definition of singleton methods associated with instances of the Fixnum or Symbol class. 3 Method Operations Not only can you define new methods to classes and modules, you can also make aliases to the methods and even remove them from the class. alias Statement alias new old Creates an alias new for an existing method, operator or global variable, specified by old.

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