Function useMemo

test/neverland.js:507–516

(memo, guards)

  /*! (c) Andrea Giammarchi - ISC */
  var useMemo = function useMemo(memo, guards) {
    var state = current();
    var i = state.i++;
    var stack = state.stack;
    if (!guards || stack.length <= i || guards.some(different, stack[i].values)) stack[i] = {
      current: memo(),
      values: guards
    };
    return stack[i].current;
  };
  var useCallback = function useCallback(fn, guards) {
    return useMemo(function () {
      return fn;