handson.io
JAvascript
Functional inheritance
Alan Hortz @alanhortz
Benoît Toussaint @bantoutou
Reference
Inheritance
"It is a form of code reuse"
"Patterns of code reuse are extremely important because they have the potential to significantly reduce the cost of software development"
- Douglas Crockford, Javascript, The good parts
"A way of obtaining code code without writing it. In particular, a subclass can inherit the implementations of its superclass's method."
- Barbara Liskov, Program Development in Java
Classical inheritance
Objects are defined by classes
Classes can inherit attributes and
behavior from pre-existing classes
DIFFERENTIAL inheritance
Common inheritance model used by
prototype-based programming languages
Objects are derived from others
Only differ in a few small aspects.
Functional inheritance in JS
Why bother ?
Pros
Better encapsulation
Real privacy vs Pretended privacy
Tamper-proof objects
Object composition
Cons
Performance
Put your Hands-on !
Door
Lockable Door
Delegation of the locking behavior to a WardedLock