Macro map

macro_rules! map {
    ($array:expr, |$param:tt $(: $type:ty)?| $mapper:expr $(,)? ) => { ... };
    ($array:expr, | $($anything:tt)* ) => { ... };
    ($array:expr, $function:expr $(,)?) => { ... };
}

Const equivalent of array::map.

Limitation: requires $array and the elements returned by the passed-in function to be Copy.

Example

use konst::array;

const TRIMMED: [&str; 3] = array::map!(["  foo", "bar  ", "  baz  "], konst::string::trim);
assert_eq!(TRIMMED, ["foo", "bar", "baz"]);

const LENGTHS: [usize; 3] = array::map!(["foo", "hello", "bar baz"], |s| s.len());
assert_eq!(LENGTHS, [3, 5, 7]);

const SQUARED: [u32; 6] = array::map!([1, 2, 3, 4, 5, 6], |x: u32| x.pow(2));
assert_eq!(SQUARED, [1, 4, 9, 16, 25, 36]);