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# icu_casemap [](https://crates.io/crates/icu_casemap)
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Case mapping for Unicode characters and strings.
This module is published as its own crate ([`icu_casemap`](https://docs.rs/icu_casemap/latest/icu_casemap/))
and as part of the [`icu`](https://docs.rs/icu/latest/icu/) crate. See the latter for more details on the ICU4X project.
## Examples
```rust
use icu::casemap::CaseMapper;
use icu::locale::langid;
let cm = CaseMapper::new();
assert_eq!(
cm.uppercase_to_string("hello world", &langid!("und")),
"HELLO WORLD"
);
assert_eq!(
cm.lowercase_to_string("Γειά σου Κόσμε", &langid!("und")),
"γειά σου κόσμε"
);
```
[`ICU4X`]: ../icu/index.html
<!-- cargo-rdme end -->
## More Information
For more information on development, authorship, contributing etc. please visit [`ICU4X home page`](https://github.com/unicode-org/icu4x).