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ClojureCLR v2.5 Release Notes

  • reduce-kv reduces an associative collection. It takes a function f, an initial value init and an associative collection coll. f should be a function of 3 arguments. Returns the result of applying f to init, the first key and the first value in coll, then applying f to that result and the 2nd key and value, etc. If coll contains no entries, returns init 👍 and f is not called. Note that reduce-kv is supported on vectors, where the keys will be the ordinals.

    (reduce-kv str "Hello " {:w \o :r \l :d \!})
;=> "Hello :rl:d!:wo"
(reduce-kv str "Hello " [\w \o \r \l \d \!])
;=> "Hello 0w1o2r3l4d5!"