Specs

average(t()) :: nil | integer()

Calculates the average of the elements in the enumerable.

It should return nil if the enumerable is empty.

Specs

chunk_by_pairwise(t(), (element(), element() -> boolean())) :: t()

Partitions the elements of the enumerable according to the pairwise comparator.

Examples

iex> EnumExtras.chunk_by_pairwise([1, 2, 3, 4, 1, 2, 3, 1, 2, 1], fn a, b -> a <= b end)
[[1, 2, 3, 4], [1, 2, 3], [1, 2], [1]]

Specs

weighted_average(t(), t()) :: nil | integer()

Calculates the weighted average of the elements in the enumerable.

It should return nil if the enumerable is empty or the weights sum to zero.