closure-advanced.js

/**
 * @param {Object.<string, boolean>} data
 * @return {number}
 */
function hello(data) {
  var q = 0;
  if (data.a) {
    if (data.b && data.c) {
      q = 1
    } else if (data.d) {
      q = 2;
    } else if (!data.b) {
      throw new Error('nope');
    } else {
      throw new Error('denied');
    }
  }
  return q;
}

/**
 * @param {Object.<string, boolean>} data
 * @return {string}
 */
function q(data) {
  try {
    return hello(data) + '';
  } catch (err) {
    return err.message;
  }
}

/**
 * @param {Object.<string, boolean>} data
 * @param {string} expect
 * @return {boolean}
 */
function test(data, expect) {
  var body = JSON.stringify(data) + ' === ' + JSON.stringify(expect);
  var res = q(data) === expect;
  console.log(body, res);
  return res;
}

window['a'] = test({'a': true, 'b': true, 'c': true, 'd': true}, '1');
window['b'] = test({'a': true, 'b': true, 'c': true, 'd': false}, '1');
window['c'] = test({'a': true, 'b': true, 'c': false, 'd': true}, '2');
window['d'] = test({'a': true, 'b': true, 'c': false, 'd': false}, 'denied');
window['e'] = test({'a': true, 'b': false, 'c': false, 'd': true}, '2');
window['f'] = test({'a': true, 'b': false, 'c': false, 'd': false}, 'nope');
window['g'] = test({'a': false, 'b': false, 'c': false, 'd': false}, '0');