igstan

var push = function (value) {
  return function (stack) {
    var newStack = [value].concat(stack);
    return { value:undefined, stack:newStack };
  };
};

var pop = function () {
  return function (stack) {
    var value = stack[0];

igstan

push = (element) -> (stack) ->
  newStack = [element].concat stack
  {value: element, stack: newStack}

pop = (stack) ->
  element = stack[0]
  newStack = stack.slice 1
  {value: element, stack: newStack}

bind = (stackOperation, continuation) -> (stack) ->