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| -rw-r--r-- | src/doc/trpl/strings.md | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/doc/trpl/strings.md b/src/doc/trpl/strings.md index 55154036286..7d5c43ea14c 100644 --- a/src/doc/trpl/strings.md +++ b/src/doc/trpl/strings.md @@ -117,6 +117,30 @@ let dog = hachiko.chars().nth(1); // kinda like hachiko[1] This emphasizes that we have to go through the whole list of `chars`. +## Slicing + +You can get a slice of a string with slicing syntax: + +```rust +let dog = "hachiko"; +let hachi = &dog[0..5]; +``` + +But note that these are _byte_ offsets, not _character_ offsets. So +this will fail at runtime: + +```rust,should_panic +let dog = "忠犬ハチ公"; +let hachi = &dog[0..2]; +``` + +with this error: + +```text +thread '<main>' panicked at 'index 0 and/or 2 in `忠犬ハチ公` do not lie on +character boundary' +``` + ## Concatenation If you have a `String`, you can concatenate a `&str` to the end of it: |