Church numerals

church.hs

zero = \s z -> z
one = λs z -> s z
two = λs z -> (s . s) z

arabic = \n -> n + 1
pipes = \n -> n ++ "|"

--two arabic 0
-- 2

--two pipes ""
-- ||

church.js

zero = function (next, acc) {
  return acc;
}

one = function (next, acc) {
  return next(acc);
}

two = function (next, acc) {
  return next(next(acc));
}


arabic = function (acc) {
  return acc + 1;
}

pipes = function (acc) {
  return acc + "|";
}


console.log(two(arabic, 0));
// 2

console.log(two(pipes, ""));
// ||