2 unstable releases
Uses old Rust 2015
0.2.0 | Jan 11, 2023 |
---|---|
0.1.0 | Jan 17, 2022 |
#983 in Rust patterns
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Used in 3,302 crates
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option-ext
Introduction
This crate extends Option
with additional methods, currently:
contains
map_or2
(as a replacement formap_or
)map_or_else2
(as a replacement formap_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
option-ext = "0.2.0"
into the [dependencies]
section of your Cargo.toml file.
Example
use option_ext::OptionExt;
fn example_contains() {
let x: Option<u32> = Some(2);
assert_eq!(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 example_map_or2() {
let x = Some("bar");
assert_eq!(x.map_or2(|v| v.len(), 42), 3);
let x: Option<&str> = None;
assert_eq!(x.map_or2(|v| v.len(), 42), 42);
}
fn example_map_or_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);
}