Currying a proc with keyword arguments in Ruby

Question

Say I have a generic Proc, Lambda or method which takes an optional second argument:

pow = -> (base, exp: 2) { base         


        

Answer 1

Extending @Stefan answer above as per last comment and in line with his snippet:

def curry(method)
  -> (*args, **kargs) {
    required  = method.parameters.select { |type, _| type == :req }
    krequired = method.parameters.select { |type, _| type == :keyreq }
    all_args = (required.length <= args.length)
    all_keys = krequired.all? { |_, name| kargs.has_key?(name) }
    if all_args && all_keys
      final_args = (args + kargs.map {|k,v| {k => v} })
      method.call(*final_args)
    else
      -> (*args_, **kargs_) { curry(method)[*args, *args_, **kargs, **kargs_] }
    end
  }
end

def foo(a1, b1, c1 = 5, a2:, b2:, c2: 50)
  { a1: a1, b1: b1, c1: c1, a2: a2, b2: b2, c2: c2}
end

puts foz = curry(method(:foo)) #=> #
puts bar = foz[6,  a2: 60]     #=> #
puts bar[1, b2: 10]            #=> {:a1=>6, :b1=>1, :c1=>5, :a2=>60, :b2=>10, :c2=>50}
puts baz = bar[1]              #=> #
puts baz[10, b2: 30, c2: 40]   #=> {:a1=>6, :b1=>1, :c1=>10, :a2=>60, :b2=>30, :c2=>40}