Advanced compilation version of hasChainOfKeys

example.js

// Example usage:
var example1 = {foo: {bar: 1}},
    example2 = {foo: {bar: 1, qux: 1}},
    example3 = {foo: {BAZ: 1}},
    
    template1 = {foo: {bar: 1}}
    template2 = {foo: {bar: {qux: 1}}}},

// returns true: all keys from the template exist in the object    
hasChainOfKeys(example1, template1);

// returns true: all keys from the template exist in the object   
hasChainOfKeys(example2, template1);

// returns false: object doesn't have `foo.bar`
hasChainOfKeys(example3, template1);

// returns false: foo.bar exists, but it isn't an object
hasChainOfKeys(example1, template2);

hasChainOfKeys.js

/**
 * Tests if object has the same keys as a template:
 * @param {Object} obj The object to be tested.
 * @param {Object} tmpl The template to be used.
 */
function hasChainOfKeys (obj, tmpl) {
  var prop;
  // Checks every property of the template:
  for (prop in tmpl) {
    if (tmpl.hasOwnProperty(prop)) {
      // Checks if the object have this property:
      if (obj.hasOwnProperty(prop)) {
        // Also recurse the object chain:
        if (typeof tmpl[prop] === 'object')
          if (typeof obj[prop] === 'object') {
            if (!hasChainOfKeys(obj[prop], tmpl[prop])) {
              return false;
            }
          } else {
            return false;
          }
        }
      } else {
        return false;
      }
    }
  }
  return true;
}