mapAtOrElse

mapAtOrElse(array, index, mapper, callback)

Applies the mapper function to the element at the specified index in array, returning a new array with the mapped element, or the result of calling callback with the array if the index is out of bounds.

data-first

mapAtOrElse(
    [1, 2, 3],
    10,
    (x) => x * 10,
    (arr) => arr.length,
); // 3

data-last

pipe(
    [1, 2, 3],
    mapAtOrElse(
        10,
        (x) => x * 10,
        (arr) => arr.length,
    ),
); // 3