~ patch for symbols. Requires https://github.com/banister/binding_of_caller

tilde.rb

require 'binding_of_caller'

class Symbol
  def ~
    this = binding.of_caller(1).eval("self")
    this.method(self).to_proc
  end
end

def x
  "hello!"
end

def sum(a, b)
  a + b
end

def call(z)
  z.call
end

puts call ~:x

def three_plus_two(sum_function)
  sum_function.call(3, 2)
end

puts three_plus_two ~:sum

puts (~:sum)[7, 13]

one_two_three = [1, 2, 3]

puts one_two_three.reduce(0, &~:sum)
puts one_two_three.reduce(0, &:+)

def y
  def hello(name)
    "Hello, #{name}!"
  end

  ~:hello
end

puts one_two_three.map(&y).inspect

plus_three = (~:sum).curry[3]
puts one_two_three.map(&plus_three).inspect

puts one_two_three.map(&plus_three).reduce(0, &~:sum)