Module: FirstOf

Included in:
Object
Defined in:
lib/first_of.rb,
lib/first_of/version.rb

Constant Summary collapse

VERSION = 
"0.0.1"

Instance Method Summary collapse

Instance Method Details

#first_of(*args) ⇒ Object

Should take arguments: first_of(:symbol1, :symbol2) # will return first respond to and present first_of([:symbol1, :symbol2]) # will return value if try_chain(:symbol1, :symbol2) present first_of(1 => :symbol1, 2 => :symbol2) # will prioritize trying by key and return first present first_of(1 => :symbol1, 2 => lambda { _call }) # will prioritize and only execute callable if first not present first_of(1 => [:symbol1, :symbol2], 2 => -> { _call }) # will prioritize and execute try_chain on first and call 2nd if first not present first_of(1 => :symbol1, 2 => 4) # will prioritize and return value (4) if first not present first_of(lambda { _call }, 1 => :symbol1, 2 => :symbol2)



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# File 'lib/first_of.rb', line 18

def first_of(*args)
  extract_hash = args.extract_options!        

  # Don't care if the hash is empty or not because of #each call
  sorted_keys = extract_hash.keys.sort
  sorted_keys.each do |key|
    args << extract_hash[key]
  end

  args.each do |argument|
    if argument.respond_to?(:call)
      value = argument.call
    else
      value = _extract_from_message_chain(argument) # calls try_chain if array, or try if symbol, or returns value
    end

    return value if _valid_value?(value) # return value if found
  end

  return nil
end

#first_of!(*args) ⇒ Object 



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# File 'lib/first_of.rb', line 40

def first_of!(*args)
  extract_hash = args.extract_options!        

  # Don't care if the hash is empty or not because of #each call
  sorted_keys = extract_hash.keys.sort
  sorted_keys.each do |key|
    args << extract_hash[key]
  end

  args.each do |argument|
    if argument.respond_to?(:call)
      value = argument.call
    else
      value = _extract_from_message_chain(argument, :try_chain!, :proxy_try_chain!) # calls try_chain if array, or try if symbol, or returns value
    end

    return value if _valid_value?(value) # return value if found
  end

  return nil
end