Call an object method: Difference between revisions
Add Factor example
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(Add Factor example) |
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IO.puts(obj |> ObjectCall.concat("Hello ", "World!"))
</lang>
=={{header|Factor}}==
In Factor, there is no distinction between instance and static methods. Methods are contained in generic words and specialize on a class. Generic words define a <i>method combination</i> so methods know which object(s) to dispatch on. (But most methods dispatch on the object at the top of the data stack.) Under this object model, calling a method is no different than calling any other word.
<lang factor>! Define some classes.
SINGLETON: dog
SINGLETON: cat
! Define a generic word that dispatches on the object at the top
! of the data stack.
GENERIC: speak ( obj -- )
! Define methods in speak which specialize on various classes.
M: dog speak drop "Woof!" print ;
M: cat speak drop "Meow!" print ;
M: object speak drop "I don't know how to speak!" print ;
! Place three objects of different classes on the data stack.
dog cat 10
! Call speak, a method, just like any other word.
[ speak ] tri@</lang>
{{out}}
<pre>
Woof!
Meow!
I don't know how to speak!
</pre>
=={{header|Forth}}==
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