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The content of the tag is evaluated as Ruby code and is expected to be a path pointing to a Ruby template file which is read, evaluated, and rendered. Same as <% + %> but file contents are simply rendered into the output. Treats the enclosed code as a block of Ruby code and (if necessary) appends a do keyword to the body of the tag.
It has as a prerequisite that a source file with an extension of ".c" must exist. If Rake is able to find a file named "mycode.c", it will automatically create a task that builds "mycode.o" from "mycode.c". If the file "mycode.c" does not exist, Rake will attempt to recursively synthesize a rule for it.
A Ruby package is called a "gem" and can be installed via the command line. Most gems are libraries, though a few exist that are applications, such as IDEs. [63] There are over 100,000 Ruby gems hosted on RubyGems.org. [64] Many new and existing Ruby libraries are hosted on GitHub, a service that offers version control repository hosting for Git.
An existence check before reading a file can catch and/or prevent a fatal error, for instance. For that reason, most programming language libraries contain a means of checking whether a file exists. An existence check can sometimes involve a " brute force " approach of checking all records for a given identifier, as in this Microsoft Excel ...
Ruby's design forces all instance variables to be private, but also provides a simple way to declare set and get methods. This is in keeping with the idea that in Ruby one never directly accesses the internal members of a class from outside the class; rather, one passes a message to the class and receives a response.
perl561delta: File and directory handles can be autovivified; Autovivification in Perl: An In-Depth Tutorial; Autovivification in Ruby - emulate Perl's autovivification; A Use of the Y Combinator in Ruby - Implements autovivification in Ruby with the Y Combinator. Hash#autonew in the Ruby gem "facets" adds autovivification on hash reads
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RDoc, designed by Dave Thomas, is an embedded documentation generator for the Ruby programming language. It analyzes Ruby source code, generating a structured collection of pages for Ruby objects and methods. Code comments can be added in a natural style. RDoc is included as part of the Ruby core distribution.