mirror of https://github.com/KaiserY/trpl-zh-cn
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24 lines
402 B
24 lines
402 B
fn first_word(s: &String) -> &str {
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let bytes = s.as_bytes();
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for (i, &item) in bytes.iter().enumerate() {
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if item == b' ' {
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return &s[0..i];
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}
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}
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&s[..]
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}
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// ANCHOR: here
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fn main() {
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let mut s = String::from("hello world");
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let word = first_word(&s);
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s.clear(); // 错误！
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println!("the first word is: {word}");
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}
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// ANCHOR_END: here
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