Boolean helper functions

bool-helpers.js

function existy(value) {
  return value !== undefined && value !== null;
}

function falsey(value) {
  return !existy(value) || value === false;
}

function truthy(value) {
  return !falsey(value);
}

function result(value) {
  return typeof value === 'function' ? value() : value;
}

function and() {
  var tests = toArray(arguments);
  if(tests[0]) return and.apply(null, rest(tests));
  else return false;
}

function or() {
  var tests = toArray(arguments);
  if(tests[0]) return true;
  else return or.apply(null, rest(tests));
}

function ite(iff, thn, els) {
  if(result(iff)) return result(thn);
  else return result(els);
}

function unless(els, then) {}