Module: Hopscotch::StepComposers::Default

Extended by:
Default
Included in:
Default
Defined in:
lib/hopscotch/step_composers/default.rb

Instance Method Summary collapse

Instance Method Details

#call_each(*fns) ⇒ Object

‘call_each` composes a list of functions into a single function which it thens calls, returning the result of the composition

Each fn should have the rough type: “‘

fn

void -> ReturnValue

“‘



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# File 'lib/hopscotch/step_composers/default.rb', line 14

def call_each(*fns)
  compose_with_error_handling(fns).call
end

#compose_with_error_handling(*fns) ⇒ Object

Composes a list of functions into a single function.

Note that this isn’t a general purpose composition. Note a function here is anything that responds to ‘call` i.e. lambda or a singleton module.

The composed function and each constituent function have the same signature, roughly: “‘

fn

void -> ReturnValue

“‘

Note that ‘void` is used here to mean “takes no arguments”. This is a dead giveaway that functions of this type signature will have side effects.



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# File 'lib/hopscotch/step_composers/default.rb', line 31

def compose_with_error_handling(*fns)
  redcued_fn = fns.flatten.compact.inject do |composed, fn|
    -> do
      last_return = composed.call
      if Hopscotch::Error.error?(last_return)
        last_return
      else
        fn.call
      end
    end
  end
  redcued_fn || -> { Hopscotch::Step.success! }
end