Sometimes I've wanted a function that takes a value and a bunch of tests, 
and returns it if it passes every test, otherwise nil.

So I wrote if-and:

(if-and "foo"

        string?
        #(.startsWith % "f")
        #(.contains % "oo"))
;; => "foo"

(if-and "foo"
        string?
        #(.startsWith % "f")
        #(.contains % "NOT IN THE STRING"))
;; => nil


Source: https://github.com/evanescence/if-and/blob/master/src/if_and/core.clj

Does this seem useful enough to put into core?

-Steven

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