method

in?

v3.2.8 - Show latest stable - Class: Object

in?(*args)

public

Returns true if this object is included in the argument(s). Argument must be any object which responds to #include? or optionally, multiple arguments can be passed in. Usage:

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

character = "Konata"
character.in?("Konata", "Kagami", "Tsukasa") # => true

This will throw an ArgumentError if a single argument is passed in and it doesn’t respond to #include?.

# File activesupport/lib/active_support/core_ext/object/inclusion.rb, line 13
  def in?(*args)
    if args.length > 1
      args.include? self
    else
      another_object = args.first
      if another_object.respond_to? :include?
        another_object.include? self
      else
        raise ArgumentError.new("The single parameter passed to #in? must respond to #include?")
      end
    end
  end

in?

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