The usefullness of EQUALP

Дата публікації:
17/06/2013 22:30

Постійна адреса новини:
http://www.vsinovyny.com/8323842

The usefullness of EQUALP

17/06/2013 22:30 // Common Lisp Tips

Among the 4 Lisp’s equality operators equalp may be the least used, but it has some really cool features:

it matches strings ignoring case (this is well-known, I suppose)
it also matches structs
it also matches vectors and arrays
and it matches hash-tables

The last 3 are really useful, because unlike strings and other primitive types, there’s no specialized equality predicates for built-in structural types, so equalp fills this role.

(contributed by @vseloved)

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