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web host Since this class is parent to every other class, the changes become visible to all classes and objects.Ruby has been described as a multi-paradigm programming language: it allows you to program procedurally (defining functions/variables outside classes makes them part of the root, 'self' Object), with object orientation (everything is an object) or functionally (it has anonymous functions, closures, and continuations; statements all have values, and functions return the last evaluation). It has support for introspection, reflection and meta-programming, as well as support for threads. Ruby features dynamic typing, and supports parametric polymorphism.According to the Ruby FAQ, "If you like Perl, you will like Ruby and be right at home with its syntax.
web host If you like Smalltalk, you will like Ruby and be right at home with its semantics. If you like Python, you may or may not be put off by the huge difference in design philosophy between Python and Ruby/Perl." [3] Features object-oriented four levels of variable scope: global, class, instance, and local exception handling iterators and closures (based on passing blocks of code) native, Perl-like regular expressions at the language leveloperator overloading automatic garbage collecting highly portable cooperative multi-threading on all platforms using green threads DLL/shared library dynamic loading on most platformsintrospection, reflection and meta-programming large standard library supports dependency injection continuations and generators (examples in RubyGarden: continuations and generators) Ruby currently lacks full support for Unicode, though it has partial support for UTF-8. Interaction The Ruby official distribution also includes "irb", an interactive command-line interpreter which can be used to test code quickly. A session with this interactive program might be: $ irb irb(main):001:0> "Hello, World" => "Hello, World" irb(main):002:0> 1+2 => 3 Syntax The syntax of Ruby is broadly similar to Perl and Python.
web host Class and method definitions are signaled by keywords. In contrast to Perl, variables are not obligatorially prefixed with a sigil. (When used, the sigil changes the semantics of scope of the variable.) The most striking difference from C and Perl is that keywords are typically used to define logical code blocks, without brackets. Line breaks are significant and taken as the end of a statement; a semicolon may be equivalently used.
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