chickadee » transducers » interleave-range

A transducer that interleaves a range in between items from the current transduction. If there aren't enough elements in either the current transduction or the range being interleaved then the transducer exits early.

 
(import transducers)

(transduce list-fold
           (interleave-range (range 0 4))
           (collect-list)
           (list 'a 'b 'c))

; => (a 0 b 1 c 2)