of an object with regard only of the function and signature
its run-time methods
Friday, July 04, 2008
Essence of Duck
A distillation of duck typing
of an object with regard only of the function and signature
its run-time methods
of an object with regard only of the function and signature
its run-time methods
Lets
break it down:
- Its
about the later use of a new object type instead of another . - Its
about the use of data types. - What
needs to be in place for things to work. - what
the substituting object has to do to fit in. - the
substituting objects method signature needed for
compatability. - It
is what actually happens at run time that matters without the
constraint of what can be determened at compile time.
of type-checking, class hierarchy checking, in fact any 'look before
you leap' checks. Note too, that I purposefully put function before
signature - too many comments on duck typing focus on issues
of signature and assume
programmer checks for correct substitutable function are
typing.
- - Paddy.
...and attributes, sometimes.
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