C Extensions – Writing Inline C – RubyInLine
RubyInline is a framework that lets you embed other languages inside your Ruby code. It defines the Module# inline metho...
Tags：ruby
ruby – Strings – String interpolation
The double-quoted delimiter " and %Q sequence supports string interpolation using #{ruby_expression}: puts "No...
Special Constants in Ruby – $$
The process number of the Ruby running this script if you want to reproduce, please indicate the source: Special Constan...
ruby – Modules – A simple mixin with extend
A mixin is just a module that can be added (mixed in) to a class. one way to do it is with the extend method. The extend...
Special Constants in Ruby – $1, $2, etc
Contains the subpattern from the corresponding set of parentheses in the last successful pattern matched, not counting p...
ruby – Arrays – Remove all nil elements from an array with #compact
If an array happens to have one or more nil elements and these need to be removed, the Array#compact or Array#compact! m...
ruby – Arrays – Inject, reduce
Inject and reduce are different names for the same thing. In other languages these functions are often called folds (lik...
ruby – Control Flow – Case statement
Ruby uses the case keyword for switch statements. As per the Ruby Docs: Case statements consist of an optional condition...
ruby – Classes – Class Methods types
Classes have 3 types of methods: instance, singleton and class methods. Instance Methods These are methods that can be c...
ruby – Modules – Module as Namespace
Modules can contain other modules and classes: module Namespace module Child class Foo; end end # module Child # Foo can...
ruby – Modules and Class Composition
You can use Modules to build more complex classes through composition. The include ModuleName directive incorporates a m...
ruby – Rounding Numbers
The round method will round a number up if the first digit after its decimal place is 5 or higher and round down if that...
ruby – Iterating over a range
You can easily do something to each element in a range. (1..5).each do |i| print i end # 12345 if you want to reproduce,...
ruby – File and I/O Operations – Writing a string to a file
A string can be written to a file with an instance of the File class. file = File.new('tmp.txt', 'w') file.write("N...
ruby – Methods – Defining a method
Methods are defined with the def keyword, followed by the method name and an optional list of parameter names in parenth...