chickadee » transducers » take-while

take nprocedure
take-while nprocedure

take is a transducer that takes n many items before ending the transduction early (assuming at least n items exist. If fewer than n items exist, take doesn't do anything). take-while continues to take items as long as each item satisfies pred?. take-while exits early on the first item that does not satisfy pred?.

(import transducers)

(transduce list-fold
           (take 2)
           (list 1 2 3 4 5))

; => (1 2)

(transduce list-fold
           (take-while symbol?)
           (list 'a 'b 'c 'd 1 2 3 'e 'f 'g))

; => (a b c d)