In core.match, what's the difference between predicates (:when) and guards (:guard)?

[retnuH]

I can't really figure out what the deal is with predicates.  They're not mentioned in the Basic/Advanced usage wiki pages at all.  The code for Guards and Predicates is basically identical.

The only difference that I've been able to find (beyond the spelling, obviously):

- predicates can only be symbols, i.e. they can't be function declarations (#() or (fn))

- predicates have to be pre-declared with defpred

Am I missing something?  Is there some use case that predicates fill that guards don't?

Cheers,

H

[David Nolen]

core.match will attempt to optimize matching :when clauses in the decision tree.

David

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[Hunter Kelly]

Okay, thanks!

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