Map map

Applies a function to each element of a list and returns a new list with the results.

Syntax

(map function list)

Examples

Basic mapping with lambda functions

↪ (map (fn [x] (+ x 1)) [1 2 3])
[2 3 4]

↪ (map (fn [x] (* x 2)) [1 2 3])
[2 4 6]

↪ (map (fn [x] (as 'String x)) [1 2 3])
["1" "2" "3"]

Mapping with operators

↪ (map + 5 [4 5 6])
[9 10 11]

Mapping with built-in functions

↪ (map count (list (list "aaa" "bbb")))
[2]

Nested mapping

↪ (set l (list 1 2 3 4))
↪ (map (fn [x] (map (fn [y] (+ x y)) l)) l)
(list [2 3 4 5] [3 4 5 6] [4 5 6 7] [5 6 7 8])

Notes

• The function is applied to each element individually
• Works with any type of list or vector
• Commonly used with lambda functions defined with fn
• Returns a new list without modifying the original