CODEWITHSUNDEEP
clojuremacros
Stephen Cagle
Stephen Cagle

Reputation: 14524

Where did "-?>" go?

I am looking for "-?>", which works identically to "->" unless one of the threaded functions returns nil. If nil is ever encountered in the threading process, the return value of the threading expression is nil. Useful.

Here is where I am finding mention of this thing. http://clojuredocs.org/clojure_contrib/clojure.contrib.core/-_q%3E

from above site

Same as clojure.core/-> but returns nil as soon as the threaded value is nil itself (thus short-circuiting any pending computation).
Examples :
(-?> "foo" .toUpperCase (.substring 1)) returns "OO"
(-?> nil .toUpperCase (.substring 1)) returns nil

I am on clojure 1.4.

What/where/how do I get access to this functionality? Thank you.

Upvotes: 3

Views: 101

Answers (1)

DaoWen
DaoWen

Reputation: 33019

Where did clojure.contrib go? lists that clojure.contrib.core was (partially) migrated to clojure.core.incubator. This includes the old -?> macro.

Upvotes: 4

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