ES5 lazy getter function

es5-lazygetter.js

function lazyGetter(aObject, aName, aLambda) {
  Object.defineProperty(aObject, aName, {
    get: function () {
      delete aObject[aName];
      return aObject[aName] = aLambda.apply(aObject);
    },
    configurable: true,
    enumerable  : true,
  });
}

lazyGetter(this, "bar", function () {
  return 1;
});
console.log(this.bar);// 1
this.bar++;
console.log(this.bar);// 2