map

Creates a new array from calling a function on every array element

(map fn arr)

Returns

The function returns a new array that contains the transformed values after applying the specified function to each element of the input array.

Parameters

fn (lambda) - the function to be applied to each element of the array.

arr (array) - the input array containing elements to be transformed.

• The map function applies the specified function to each element of the array in a sequential manner.

• The function passed to map can be a predefined function or an anonymous function defined using the (fn [args] body) syntax.

• The original input array remains unchanged, and a new array is returned with the transformed values.

• The map function is useful for performing transformations on arrays, such as incrementing values, applying mathematical operations, or applying custom functions to each element.

Examples

(map inc [1, 2, 3, 4, 5])              ;; increment all values
;;=> [2, 3, 4, 5, 6]

(map (fn [x] (* x 2)) [1, 2, 3, 4])    ;; multiply all values with 2
;;=> [2, 4, 6, 8]

(map (fn [symbol] {symbol}) ["AAPL", "MSFT"]) ;; creates an array of assets
;;=> [{symbol: "AAPL", close: ...}, {symbol: "MSFT", close: ...}]