MethodChain

James Coglan jcoglan at googlemail.com
Sun Jul 20 11:20:58 CEST 2008


> Name clashes aren't an issue, since MethodChain doesn't apply any
> special meaning to the method names it knows; the limitation is
> because JavaScript doesn't allow you to modify property lookup
> behavior.  And since we can make the chain object callable, we don't
> need "fire" or "toFunction" methods.

I'm the author of MethodChain, so just thought I'd confirm the above
statement. All MethodChain does is store method calls so they can
later be replayed on any object. All methods in MethodChain simply add
their name and arguments to an array inside the MethodChain instance,
they don't implement any concrete functionality. All that's important
is the names of the methods -- the object the chain is fired on will
decide how to handle those calls itself, so naming clashes aren't a
problem. For example:

var chain = it().toLowerCase().split('-').map(function() {...});
chain.fire('my-String');

is the same as

'my-String'.toLowerCase().split('-').map(function() {...});

So split() gets called on 'my-string', map() gets called on ['my',
'string']. The methods 'fire' and 'toFunction' are a problem but I
can't see any way around having them in JavaScript -- you need some
way of getting the method list out of the chain object. if JavaScript
had method_missing, we wouldn't need to tell MethodChain about names
in advance either.



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