Class: SafeOperation

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/safe_operation.rb,
lib/safe_operation/failure.rb,
lib/safe_operation/success.rb,
lib/safe_operation/version.rb

Defined Under Namespace

Classes: Failure, Success

Constant Summary collapse

VERSION = 
"2.0.0"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(success: nil, failure: nil) ⇒ SafeOperation

Returns a new instance of SafeOperation.



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# File 'lib/safe_operation.rb', line 31

def initialize(success: nil, failure: nil)
  @result = success ? Success.new(success) : Failure.new(failure)
end

Class Method Details

.failure(value) ⇒ Object 



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# File 'lib/safe_operation.rb', line 24

def failure(value)
  new(failure: value)
end

.run ⇒ Object 



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# File 'lib/safe_operation.rb', line 14

def run
  success(yield)
rescue StandardError => exception
  failure(exception)
end

.success(value) ⇒ Object 



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# File 'lib/safe_operation.rb', line 20

def success(value)
  new(success: value)
end

Instance Method Details

#and_then(&block) ⇒ Object 



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# File 'lib/safe_operation.rb', line 51

def and_then(&block)
  if success?
    self.class.success(block.call(value))
  else
    self
  end
end

#or_else(&block) ⇒ Object 



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# File 'lib/safe_operation.rb', line 59

def or_else(&block)
  if success?
    self
  else
    self.class.failure(block.call(value))
  end
end

#value_or(fallback_value) ⇒ Object 



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# File 'lib/safe_operation.rb', line 35

def value_or(fallback_value)
  if success?
    value
  else
    fallback_value
  end
end

#value_or_else(&fallback_block) ⇒ Object 



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# File 'lib/safe_operation.rb', line 43

def value_or_else(&fallback_block)
  if success?
    value
  else
    fallback_block.call(value)
  end
end