Module: Philiprehberger::Maybe

Defined in:

lib/philiprehberger/maybe.rb,
lib/philiprehberger/maybe/version.rb

Defined Under Namespace

Classes: Error, None, Some

Constant Summary

VERSION =

'0.2.1'

Class Method Summary

• .all?(*maybes) ⇒ Boolean

  Check if all arguments are Some.

• .first_some(*maybes) ⇒ Some, None

  Return the first Some from the arguments, or None if all are None.

• .wrap(value) ⇒ Some, None

  Wrap a value in a Maybe container.

Class Method Details

.all?(*maybes) ⇒ Boolean

Check if all arguments are Some

Parameters:

• maybes (Array<Some, None>) —

  the Maybe values to check

Returns:

• (Boolean) —

  true if all are Some

# File 'lib/philiprehberger/maybe.rb', line 26

def self.all?(*maybes)
  maybes.all?(&:some?)
end

.first_some(*maybes) ⇒ Some, None

Return the first Some from the arguments, or None if all are None

Parameters:

• maybes (Array<Some, None>) —

  the Maybe values to search

Returns:

• (Some, None) —

  the first Some, or None

# File 'lib/philiprehberger/maybe.rb', line 34

def self.first_some(*maybes)
  maybes.find(&:some?) || None.instance
end

.wrap(value) ⇒ Some, None

Wrap a value in a Maybe container

Parameters:

• value (Object) —

  the value to wrap

Returns:

• (Some, None) —

  Some if value is non-nil, None otherwise

# File 'lib/philiprehberger/maybe.rb', line 14

def self.wrap(value)
  if value.nil?
    None.instance
  else
    Some.new(value)
  end
end