What I was thinking

var or = function or(a, b) {
  return a || b;
};

var and = function and(a, b) {
  return a && b;
};

var not = function not(a) {
  return !a;
};

var is = function is(f) {
  
  if (f === true) return true;
  
  if (f === false) return false;
  
  if (typeof(f) === 'function') {
    this[f.name](arguments[0], arguments[1]);
  };

};

// test
is( or( true, and( true, not(false) ) ) );

/*
Note: putting the and/or/not in the 'is' closure does not work
in this set-up, since the arguments get evaluated first, outside.
 */

Ha! I see clearly now that in this approach, "is" is not even needed at all. Oops. :)