Edit Question - KnowledgeHub

Title Body

I recently read about the fact that there is a possibility of defining getters/setters in JavaScript. It seems extremely helpful - the setter is a kind of 'helper' which can parse the value to be set first, before actually setting it. For example, I currently have this code: var obj = function(value) { var test = !!value; // 'test' has to be a boolean return { get test() { return test }, set test(value) { test = !!value } }; }; var instance = new obj(true); This code always converts value to a boolean. So if you code instance.test = 0 , then instance.test === false . However, for this to work you have to actually return an object , which means that the new instance is not of type obj but just is a plain object. This means that changing the prototype of obj has no effect on instances. For example, this does not work - instance.func is undefined: obj.prototype.func = function() { console.log(this.value); }; because instance is not of type obj . To get the prototype functions work, I guess I should not return a plain object, but rather not return anything so that instance would just be of type obj , like a regular constructor works. The problem then is how to implement getters/setters? I can only find articles describing how to add these to an object, not as being part of the constructor of a custom type. So how do I implement getters/setters in the constructor so as to be able to both use getters/setters and extending the prototype?

Tags (comma-separated) Cancel