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update



    function
    boot.janet on line 1514, 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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(-> @{: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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