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update



    function
    boot.janet on line 1395, column 1

    (update ds key func & args)

    Accepts a key argument and passes its associated value to a 
    function. The key is then re-associated to the function's return 
    value. Returns the updated data structure `ds`.


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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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