unfold

A simple unfold implementation in Rust

unfold let you create an iterator that, staring from a given initial value, applies a given function to the current state, store the result for the next iteration, and return the current state.

Unfold defines an endless iterator: you must stop it by hand, like in the example.

Example

``` use unfold::Unfold;

// Create a vector containing the first 5 numbers from the Fibonacci // series let fibonaccinumbers: Vec = Unfold::new(|(a, b)| (b, a + b), (0, 1)) .map(|(a, _)| a) .take(5) //Unfold iterator never stops. .collect(); asserteq!(vec![0, 1, 1, 2, 3], fibonacci_numbers); ```