Question

Could someone give me an example of Duck Typing inheritance in Javascript? I’m exploring OO javascript and I’ve heard about duck typing but can’t see any examples of it being used in javascript.

Answer 1

The second link gives an example of a duck-typing-like pattern in js. Not saying I recommend doing this, but… well, you asked for it. 😉

In computer programming with
object-oriented programming languages,
duck typing is a style of dynamic
typing in which an object’s current
set of methods and properties
determines the valid semantics, rather
than its inheritance from a particular
class or implementation of a specific
interface.

Wikipedia – Duck typing

The simplest approach is to define the
contract informally and simply rely on
the developers at each side of the
interface to know what they are doing.
Dave Thomas has given this approach
the name of “duck typing” —if it walks
like a duck and it quacks like a duck,
then it is a duck. Similarly with our
Shape interface, if it can compute an
area and a perimeter, then it is a
Shape.

JavaScript Interfaces and Duck Typing