Module: Mutant::Util Private

Defined in:
lib/mutant/util.rb

Overview

This module is part of a private API. You should avoid using this module if possible, as it may be removed or be changed in the future.

Utility methods

Constant Summary collapse

SizeError =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Error raised by ‘Util.one` if size is less than zero or greater than one

Class.new(IndexError)

Class Method Summary collapse

Class Method Details

.max_one(array) ⇒ Object?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Return only element in array if it contains max one member

rubocop:disable Lint/EmptyInPattern

Parameters:

  • array (Array)

Returns:

  • (Object) —

    first entry

  • (nil) —

    if empty



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# File 'lib/mutant/util.rb', line 31

def self.max_one(array)
  case array
  in []
  in [value]
    value
  else
    fail SizeError, "expected size to be max 1 but size was #{array.size}"
  end
end

.one(array) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Return only element in array if it contains exactly one member

Parameters:

  • array (Array)

Returns:

  • (Object) —

    first entry



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# File 'lib/mutant/util.rb', line 14

def self.one(array)
  case array
  in [value]
    value
  else
    fail SizeError, "expected size to be exactly 1 but size was #{array.size}"
  end
end