method

in?

v7.1.3.2 - Show latest stable - Class: Object

in?(another_object)

public

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?.

# File activesupport/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

in?

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