Class: Monadify::Some

Inherits:
Option
  • Object
show all
Defined in:
lib/monadify/option/some.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Option

from

Constructor Details

#initialize(val) ⇒ Some

Returns a new instance of Some.



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# File 'lib/monadify/option/some.rb', line 6

def initialize(val)
  @value = val
end

Instance Attribute Details

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/monadify/option/some.rb', line 4

def value
  @value
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/monadify/option/some.rb', line 10

def empty?
  false
end

#flatmap ⇒ Object 



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# File 'lib/monadify/option/some.rb', line 29

def flatmap
  begin
    return_option = yield value
    case return_option
    when Monadify::None
      return_option
    when Monadify::Some
      Monadify::Some.new(return_option.value)
    else
      raise NotAnOptionError
    end
  rescue NotAnOptionError
    raise ArgumentError, 'The block should return an Option'
  rescue ArgumentError, NameError, TypeError
    raise
  rescue
    Monadify::None.new
  end
end

#map ⇒ Object 



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# File 'lib/monadify/option/some.rb', line 14

def map
  begin
    return_val = yield value
    if return_val.nil?
      Monadify::None.new
    else
      Monadify::Some.new(return_val)
    end
  rescue ArgumentError, NameError, TypeError
    raise
  rescue
    Monadify::None.new
  end
end