Function sum 

pub fn sum<T, N, F>(array: &[T], getter: F) -> N
where
    N: Sum,
    F: Fn(&T) -> N,

Sums all elements in a slice.

Arguments

• array - The input slice
• getter - Function to extract numeric values from each element

Returns

The sum of all elements

Examples

use mudssky_utils::array::sum;

let items = vec![("a", 1), ("b", 2), ("c", 3)];
assert_eq!(sum(&items, |item| item.1), 6);

let numbers = vec![1, 2, 3, 4];
assert_eq!(sum(&numbers, |&x| x), 10);