mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

book: fix the hidden find() functions in error-handling.md

Browse Source 
The hidden find() functions always returns None. Consequently, one of the
examples using find() prints "No file extension found" instead of
"File extension: rs" which is the expected output.

This patch fixes the issue by implementing find() with std::str::find().

Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
This commit is contained in:
Christophe Vu-Brugier 2016-08-12 11:49:52 +02:00
parent f55ac6944a
commit 3042fba44c
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/doc/book/error-handling.md
View File

@ -166,7 +166,7 @@ story. The other half is *using* the `find` function we've written. Let's try
to use it to find the extension in a file name.
```rust
# fn find(_: &str, _: char) -> Option<usize> { None }
# fn find(haystack: &str, needle: char) -> Option<usize> { haystack.find(needle) }
fn main() {
let file_name = "foobar.rs";
match find(file_name, '.') {
@ -223,7 +223,7 @@ Getting the extension of a file name is a pretty common operation, so it makes
sense to put it into a function:
```rust
# fn find(_: &str, _: char) -> Option<usize> { None }
# fn find(haystack: &str, needle: char) -> Option<usize> { haystack.find(needle) }
// Returns the extension of the given file name, where the extension is defined
// as all characters following the first `.`.
// If `file_name` has no `.`, then `None` is returned.
@ -272,7 +272,7 @@ Armed with our new combinator, we can rewrite our `extension_explicit` method
to get rid of the case analysis:
```rust
# fn find(_: &str, _: char) -> Option<usize> { None }
# fn find(haystack: &str, needle: char) -> Option<usize> { haystack.find(needle) }
// Returns the extension of the given file name, where the extension is defined
// as all characters following the first `.`.
// If `file_name` has no `.`, then `None` is returned.