option-ext

Introduction

This crate extends Option with additional methods, currently:

• contains
• map_or2 (as a replacement for map_or)
• map_or_else2 (as a replacement for map_or_else)

Its sister crate is result-ext, which extends Result.

Requirements

Rust 1.0 or newer.

Usage

Dependency

Add the library as a dependency to your project by inserting

toml option-ext = "0.2.0"

into the [dependencies] section of your Cargo.toml file.

Example

```rust use option_ext::OptionExt;

fn examplecontains() { let x: Option = Some(2); asserteq!(x.contains(&2), true);

let x: Option<u32> = Some(3);
assert_eq!(x.contains(&2), false);

let x: Option<u32> = None;
assert_eq!(x.contains(&2), false);

}

fn examplemapor2() { let x = Some("bar"); asserteq!(x.mapor2(|v| v.len(), 42), 3);

let x: Option<&str> = None;
assert_eq!(x.map_or2(|v| v.len(), 42), 42);

}

fn examplemapor_else2() { let k = 23;

let x = Some("bar");
assert_eq!(x.map_or_else2(|v| v.len(), || 2 * k), 3);

let x: Option<&str> = None;
assert_eq!(x.map_or_else2(|v| v.len(), || 2 * k), 46);

} ```