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Self
”More Smalltalk than Smalltalk”
Goal: to simplify the language as much as possible
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 2 / 7
Self
”More Smalltalk than Smalltalk”
Goal: to simplify the language as much as possible
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 2 / 7
Results
Fields and methods are slots
No classes, only cloning and modification
Dynamic inheritance
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 3 / 7
Results
Fields and methods are slots
No classes, only cloning and modification
Dynamic inheritance
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 3 / 7
Results
Fields and methods are slots
No classes, only cloning and modification
Dynamic inheritance
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 3 / 7
Dynamic Inheritance
Some slots may be marked parent slots.
Lookup algorithm traverses these slots.
Even when invoking a method found in a different object, the receiverdoes not change.
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 4 / 7
The Little Differences
See the following patterns: singleton, proxy, chain of responsibility, stateand strategy.
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 5 / 7
Let’s Look at Dynamic Inheritance Once More
How is it different from composition?
How is it different from ”static” inheritance?
Perhaps there exists a concept generalizing both?
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 6 / 7
Let’s Look at Dynamic Inheritance Once More
How is it different from composition?
How is it different from ”static” inheritance?
Perhaps there exists a concept generalizing both?
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 6 / 7
Let’s Look at Dynamic Inheritance Once More
How is it different from composition?
How is it different from ”static” inheritance?
Perhaps there exists a concept generalizing both?
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 6 / 7
See
James Noble and Brian Foote. Attack of the clones. In Proceedings ofthe 2002 conference on Pattern languages of programs - Volume 13(CRPIT ’02) (2002), 99–114.
Michal Pıse (CTU in Prague) Object Programming Lect. 13: Prototype Languages December 21, 2010 7 / 7
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