https://github.com/filipporanza/unfold

A simple unfold implementation in Rust
https://github.com/filipporanza/unfold

iterator iterator-library library rust unfold

Last synced: about 1 month ago
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A simple unfold implementation in Rust

• Host: GitHub
• URL: https://github.com/filipporanza/unfold
• Owner: FilippoRanza
• License: mit
• Created: 2021-01-14T19:21:52.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2021-01-19T19:08:08.000Z (over 4 years ago)
• Last Synced: 2025-04-14T22:56:23.369Z (about 1 month ago)
• Topics: iterator, iterator-library, library, rust, unfold
• Language: Rust
• Homepage: https://crates.io/crates/unfold
• Size: 11.7 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# unfold

![Rust](https://github.com/FilippoRanza/unfold/workflows/Rust/badge.svg?branch=master) ![crates.io](https://img.shields.io/crates/v/unfold.svg)

A simple unfold implementation in Rust

[unfold](https://en.wikipedia.org/wiki/Fold_(higher-order_function)) 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

```rust

use unfold::Unfold;

// Create a vector containing the first 5 numbers from the Fibonacci

// series

let fibonacci_numbers: Vec = Unfold::new(|(a, b)| (b, a + b), (0, 1))

                                         .map(|(a, _)| a)

                                         .take(5)  //Unfold iterator never stops.

                                         .collect();

assert_eq!(vec![0, 1, 1, 2, 3], fibonacci_numbers);

```