PR 3085 Code

compiled.js

function b(a) {
  return function() {
    return a;
  };
}
var c = {b:"a", abbr:"abbr", c:"address", d:"area", a:"article", e:"aside"}, d = {}, e;
for (e in c) {
  hasOwnProperty.call(c, e) && (d[e] = b.call(void 0, c[e]));
}
var g = "a abbr address area article aside".split(" ").reduce(function(a, f) {
  a[f] = b(f);
  return a;
}, {});
console.log(d.a(), g.a());

original.js

// ==ClosureCompiler==
// @compilation_level ADVANCED_OPTIMIZATIONS
// @output_file_name default.js
// @formatting pretty_print
// ==/ClosureCompiler==


function mapObject(object, callback, context) {
  if (!object) {
    return null;
  }
  var result = {};
  for (var name in object) {
    if (hasOwnProperty.call(object, name)) {
      result[name] = callback.call(context, object[name], name, object);
    }
  }
  return result;
}

function createDOMFactory(tag) {
  // simplified
  return function() { return tag };
}


var ReactDOM = mapObject({
  a: 'a',
  abbr: 'abbr',
  address: 'address',
  area: 'area',
  article: 'article',
  aside: 'aside'
}, createDOMFactory);

var ReactDOM2 = [
  'a',
  'abbr',
  'address',
  'area',
  'article',
  'aside'
].reduce(function(DOM, tag) {
  DOM[tag] = createDOMFactory(tag);
  return DOM;
}, {});


console.log(ReactDOM.article(), ReactDOM2.article());