Class: Proc

Inherits:
Object show all
Defined in:
lib/backports/1.9.1/proc/curry.rb,
lib/backports/1.9.1/proc/lambda.rb,
lib/backports/2.6.0/proc/compose.rb,
lib/backports/1.9.1/proc/case_compare.rb

Instance Method Summary collapse

Instance Method Details

#<<(g) ⇒ Object 



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# File 'lib/backports/2.6.0/proc/compose.rb', line 3

def <<(g)
  if lambda?
    lambda { |*args, &blk| call(g.call(*args, &blk)) }
  else
    proc { |*args, &blk| call(g.call(*args, &blk)) }
  end
end

#>>(g) ⇒ Object 



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# File 'lib/backports/2.6.0/proc/compose.rb', line 11

def >>(g)
  if lambda?
    lambda { |*args, &blk| g.call(call(*args, &blk)) }
  else
    proc { |*args, &blk| g.call(call(*args, &blk)) }
  end
end

#curry(argc = nil) ⇒ Object 



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# File 'lib/backports/1.9.1/proc/curry.rb', line 5

def curry(argc = nil)
  min_argc = arity < 0 ? -arity - 1 : arity
  argc ||= min_argc
  if lambda? and arity < 0 ? argc < min_argc : argc != arity
    raise ArgumentError, "wrong number of arguments (#{argc} for #{min_argc})"
  end
  creator = lambda? ? :lambda : :proc
  block = send(creator) do |*args|
    if args.size >= argc
      call(*args)
    else
      send(creator) do |*more_args|
        args += more_args
        block.call(*args)
      end
    end
  end
end

#lambda? ⇒ Boolean

Standard in Ruby 1.9. See official documentation

Returns:

  • (Boolean) 


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# File 'lib/backports/1.9.1/proc/lambda.rb', line 6

def lambda?
  !!__is_lambda__
end