Stream.scan

You're seeing just the function scan, go back to Stream module for more information.

Specs

scan(Enumerable.t(), (element(), acc() -> any())) :: Enumerable.t()

Creates a stream that applies the given function to each element, emits the result and uses the same result as the accumulator for the next computation. Uses the first element in the enumerable as the starting value.

Examples

iex> stream = Stream.scan(1..5, &(&1 + &2))
iex> Enum.to_list(stream)
[1, 3, 6, 10, 15]

Specs

scan(Enumerable.t(), acc(), (element(), acc() -> any())) :: Enumerable.t()

Creates a stream that applies the given function to each element, emits the result and uses the same result as the accumulator for the next computation. Uses the given acc as the starting value.

Examples

iex> stream = Stream.scan(1..5, 0, &(&1 + &2))
iex> Enum.to_list(stream)
[1, 3, 6, 10, 15]