Function split_first

pub const fn split_first<T>(slice: &[T]) -> Option<(&T, &[T])>

A const equivalent of <[T]>::split_first

Example

use konst::slice;

const fn add_up(mut slice: &[u32]) -> u64 {
    let mut ret = 0u64;
    while let Some((first, rem)) = slice::split_first(slice) {
        ret += *first as u64;

        // advances the slice
        slice = rem;
    }
    ret
}

assert_eq!(add_up(&[1]), 1);
assert_eq!(add_up(&[1, 2]), 3);
assert_eq!(add_up(&[1, 2, 3]), 6);
assert_eq!(add_up(&[1, 2, 3, 4]), 10);