mirror of
https://github.com/KaiserY/trpl-zh-cn
synced 2025-02-25 05:42:18 +08:00
24 lines
401 B
Rust
24 lines
401 B
Rust
|
fn first_word(s: &String) -> &str {
|
||
|
|
let bytes = s.as_bytes();
|
||
|
|
|
||
|
|
for (i, &item) in bytes.iter().enumerate() {
|
||
|
|
if item == b' ' {
|
||
|
|
return &s[0..i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
&s[..]
|
||
|
|
}
|
||
|
|
|
||
|
|
// ANCHOR: here
|
||
|
|
fn main() {
|
||
|
|
let mut s = String::from("hello world");
|
||
|
|
|
||
|
|
let word = first_word(&s);
|
||
|
|
|
||
|
|
s.clear(); // error!
|
||
|
|
|
||
|
|
println!("the first word is: {}", word);
|
||
|
|
}
|
||
|
|
// ANCHOR_END: here
|