Method: Object#in?

Defined in:
lib/active_support/core_ext/object/inclusion.rb

#in?(another_object) ⇒ Boolean

Returns true if this object is included in the argument.

When argument is a Range, #cover? is used to properly handle inclusion check within open ranges. Otherwise, argument must be any object which responds to #include?. Usage:

characters = ["Konata", "Kagami", "Tsukasa"]
"Konata".in?(characters) # => true

For non Range arguments, this will throw an ArgumentError if the argument doesn’t respond to #include?.

Returns:

  • (Boolean)
[View source]

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# File 'lib/active_support/core_ext/object/inclusion.rb', line 15

def in?(another_object)
  case another_object
  when Range
    another_object.cover?(self)
  else
    another_object.include?(self)
  end
rescue NoMethodError
  raise ArgumentError.new("The parameter passed to #in? must respond to #include?")
end