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case

core-api



    macro
    boot.janet on line 257, column 1

    (case dispatch & pairs)

    Select the body that equals the dispatch value. When `pairs` has an 
    odd number of elements, the last is the default expression. If no 
    match is found, returns nil.

See also:cond match2 examplesSign in to add an example

# Walk from the API is defined using a case 

(defn walk
  `Iterate over the values in ast and apply f
  to them. Collect the results in a data structure. If ast is not a
  table, struct, array, or tuple,
  returns form.`
  [f form]
  (case (type form)
    :table (walk-dict f form)
    :struct (table/to-struct (walk-dict f form))
    :array (walk-ind f form)
    :tuple (let [x (walk-ind f form)]
             (if ( $=$  :parens (tuple/type form))
               (tuple/slice x)
               (tuple/brackets ;x)))
    form))

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(defn output [x]
  (case x
    :a "a"
    "b"))

(output :a) # => "a"
(output "anything else") # => "b"

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