Class: MPrelude::Either

Inherits:

Object

• Object
• MPrelude::Either

Includes:

AbstractType, Adamantium::Flat, Functor

Defined in:

lib/mprelude.rb

Overview

Maybe

Direct Known Subclasses

Left, Right

Defined Under Namespace

Classes: Left, Right

Class Method Summary

• .wrap_error(*exceptions) ⇒ Either<Exception, Object>

  Execute block and wrap error in left.

Instance Method Summary

• #left? ⇒ Boolean

  Test for left constructor.

• #right? ⇒ Boolean

  Test for right constructor.

Class Method Details

.wrap_error(*exceptions) ⇒ Either<Exception, Object>

Execute block and wrap error in left

Parameters:

• exception (Class<Exception>)

Returns:

• (Either<Exception, Object>)

# File 'lib/mprelude.rb', line 86

def self.wrap_error(*exceptions)
  Right.new(yield)
rescue *exceptions => error
  Left.new(error)
end

Instance Method Details

#left? ⇒ Boolean

Test for left constructor

Returns:

• (Boolean)

# File 'lib/mprelude.rb', line 95

def left?
  instance_of?(Left)
end

#right? ⇒ Boolean

Test for right constructor

Returns:

• (Boolean)

# File 'lib/mprelude.rb', line 102

def right?
  instance_of?(Right)
end