Object vs Class vs Function

Question

I was wondering - what\'s the difference between JavaScript objects, classes and functions? Am I right in thinking that classes and functions are types of objects?

A

Answer 1

Object is the base type in JavaScript i.e. all the user defined data types inherits from Object in one way or another. So if you define a function or a class [note as of now JS doesn't support class construct, but its proposed in ECMAScript version 6], it will implicitly inherit from Object type.

Classes are really used for encapsulating logical functions and properties into one type / entity and you can 'new' it up using constructor syntax. So if you define a 'Customer' class, you can instantiate it multiple times and each instance / object can have different values. They can even share the values if you define class level value using prototype.

Since JS doesn't support class construct at the moment, functions can really act as individual method as well as container for other functions or types.

I hope with ECMAScript 6 we will have clear separation between these constructs similar to what we have in other languages like C#, Java etc.