Method: Enumerator#result!

Defined in:
lib/mini_sanity/results.rb

#result!(&block) ⇒ Object

Iterates the Enumerator with a given block, and checks that the result is not nil. Raises an exception if the result is nil. Otherwise, returns the non-nil result.

Examples:

[1, 2, 3].find.result!(&:even?)  # == 2
[1, 3, 5].find.result!(&:even?)  # raises exception

Returns:

Raises:

  • (ArgumentError) —

    if no block is provided

  • (MiniSanity::Error) —

    if iterating results in a nil value



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# File 'lib/mini_sanity/results.rb', line 55

def result!(&block)
  raise ArgumentError, "Enumerator#result! requires a block" unless block

  result = self.each(&block)

  if result.nil?
    raise MiniSanity::Error.new("Nil result from Enumerator with block", {
      "Enumerator" => self.inspect,
      "Block" => MiniSanity::Error.describe_block(&block),
    })
  end

  result
end