Function rufl::collection::reduce

source · 
pub fn reduce<C: AsRef<[T]>, T, U>(
    collection: &C,
    accumulator: impl Fn(&U, &T, usize) -> U,
    initial: U
) -> U
Expand description

Reduces collection to a value which is the accumulated result of running each element in collection thru iteratee, where each successive invocation is supplied the return value of the previous.

  • accumulator function signature: fn(agg: U, item: T, index: usize) -> U

§Arguments

  • collection - The collection to iterate over.

  • accumulator - The function invoked per iteration.

  • initial - The initial value.

§Returns

Returns the accumulated value.

§Examples

use rufl::collection;

assert_eq!(15, collection::reduce(&vec![1, 2, 3, 4, 5], |x: &i32, y: &i32, i: usize| { x + y }, 0));

assert_eq!(120, collection::reduce(&vec![1, 2, 3, 4, 5], |x: &i32, y: &i32, i: usize| { x * y }, 1));