Neither forward nor backward compatibility is guaranteed about the return value of this method. This system is hosting the development of ruby language and its related projects Ruby documentation welcome to the official ruby programming language documentation
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Getting started new to ruby
Start with our getting started guide
Core classes and modules explore the essential classes and modules If you have found an issue that affects a specific ruby community’s gem, follow the instructions on rubygems.org Nearly all of these libraries are released in the form of a gem, a packaged library or application that can be installed with a tool called rubygems. What’s here trigonometric functions ::cos
Returns the cosine of the given argument Returns the sine of the given argument Returns the tangent of the given argument Returns the arc cosine of the given.
Operators in ruby, operators such as +, are defined as methods on the class
Literals define their methods within the lower level, c language Ruby objects can define or overload their own implementation for most operators Class foo < string def + (str) self Ruby code can raise exceptions
Most often, a raised exception is meant to alert the running program that an unusual (i.e., exceptional) situation has arisen, and may need to be handled. Each of these methods takes optional argument format, which has zero or more embedded format specifications (see below). Language = hash [:language] end end matz = dev 'ruby') matz # => #<dev
@name=matz, @language=ruby> creating a hash you can create a hash object explicitly with
You can convert certain objects to hashes with You can create a hash by calling method hash.new:
