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get-in



    function
    boot.janet on line 1463, column 1

    (get-in ds ks &opt dflt)

    Access a value in a nested data structure. Looks into the data 
    structure via a sequence of keys. If value is not found, and `dflt` 
    is provided, returns `dflt`.

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(get-in  {:a {:cc 2} :b {:dd 3}}  [:a]     42)  # => {:cc 2}
(get-in  {:a {:cc 2} :b {:dd 3}}  [:a :cc] 42)  # => 2

(get-in  {:a {:cc 2} :b {:dd 3}}  [0]  42)  # => 42
(get-in  {:a {:cc 2} :b {:dd 3}}  [:z] 42)  # => 42

cellularmitosisPlayground

(get-in  [[4 5] [6 7]]  [0]    42)  # => (4 5)
(get-in  [[4 5] [6 7]]  [0 1]  42)  # => 5

(get-in  [[4 5] [6 7]]  [-1]     42)  # => 42
(get-in  [[4 5] [6 7]]  [9 9 9]  42)  # => 42

cellularmitosisPlayground

(def request {:params {:id 1}}) # => {:params {:id 1}}

(get-in request [:params :id]) # => 1

(get-in request [:params :name]) # => nil

(get-in request [:params :name] "N/A") # => "N/A"

inchingforwardPlayground