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put-in

core-api



    function
    boot.janet on line 1645, column 1

    (put-in ds ks v)

    Put a value into a nested data structure `ds`. Looks into `ds` via 
    a sequence of keys. Missing data structures will be replaced with 
    tables. Returns the modified, original data structure.

See also:put2 examplesSign in to add an example

(def record @{:recipient @{:name "Bob" :age 60} :sender @{:name "Alice" :age 21}})

(put-in
  record
  [:sender :age] 
  26)

# @{:recipient @{:name "Bob" :age 60} :sender @{:name "Alice" :age 26}}

(put-in
  record
  [:recipient] 
  @{:name "Carl"})

# @{:recipient @{:name "Carl"} :sender @{:name "Alice" :age 26}}

felixrPlayground

(put-in  @{:a @{:aa 5} :b @{:bb 6}}  [:c]          9)  # => @{:a @{:aa 5} :b @{:bb 6} :c 9}
(put-in  @{:a @{:aa 5} :b @{:bb 6}}  [:a :aa]      9)  # => @{:a @{:aa 9} :b @{:bb 6}}
(put-in  @{:a @{:aa 5} :b @{:bb 6}}  [:a :cc :ddd] 9)  # => @{:a @{:cc @{:ddd 9} :aa 5} :b @{:bb 6}}

(put-in  @[:a :b @[:aa :bb :cc]]  [2 1] :zz )  # => @[:a :b @[:aa :zz :cc]]
(put-in  @[:a :b @[:aa :bb :cc]]  [5]   :z  )  # => @[:a :b @[:aa :bb :cc] nil nil :z]

(put-in  @[:a :b @[:aa :bb :cc]]  [4 0]   :zz )  # => @[:a :b @[:aa :bb :cc] nil @{0 :zz}]
(put-in  @[:a :b @[:aa :bb :cc]]  [4 :yy] :zz )  # => @[:a :b @[:aa :bb :cc] nil @{:yy :zz}]

cellularmitosisPlayground