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update

core-api


    function
    boot.janet on line 1666, column 1

    (update ds key func & args)

    For a given key in data structure `ds`, replace its corresponding 
    value with the result of calling `func` on that value. If `args` 
    are provided, they will be passed along to `func` as well. Returns 
    `ds`, updated.
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(update @{:data @[:cherry :orange]} :data (comp sorted |(array/push $ :apple)))
# => {:data @[:apple :cherry :orange]}


# note that all data structures must be mutable with @
(def c @{:size :small :roast :dark :add-ins @[:soy :almond :soy]})
(defn add! [coffee extra]
  (update coffee :extras (comp sort |(array/push $ extra))))
(add! c :chocolate)
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(-> @{:a 0 :b 0}
    (update :a inc)
    (update :b inc))
# => @{:a 1 :b 1}
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(update @{:a 1} :a inc)
# => @{:a 2}
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(update @[3 4 5] 1 dec)  # => @[3 3 5]
(update (update @[3 4 5] 1 dec) 2 inc)  # => @[3 3 6]
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