– functional inheritance -> prototypal inheritance –> pseudo classical inheritance –> hacked classical inheritance
Functional inheritance
– Functional can be achieved by any language who supports closure scope and dynamic object augmentation.
– The bad parts are duplicated properties and methods / impossible to achieve dynamic class modification.
– The good parts are: real private variables / callable instances.
Pseudo classical inheritance
– For pseudo classical, semi private variable is achieved by name convention, i.e. _variable_name.
– Comparison among pseudo classical, prototypal and functional
| pseudo classical | prototypal | functional | |
| start out simple | no | sort of | yes |
| keep simple | no | yes | yes |
| Method sharing | Method sharing | Method sharing with a performance penalty or capability security | |
| Dynamic class modification | Dynamic class modification | Avoid using ‘this’ | |
| instanceOf works at all level | instanceOf works at all level | callable instance / instanceOf doesn’t work at all level / no prototypal masking | |
| Optimized by the engine | Avoid using ‘new’ and ‘.prototype’ | Avoid using ‘new’ and ‘.prototype’ |
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