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zachgordon25

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zachgordon25
Apr 3rd, 2025
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Rust 1.18 KB | None | 0 0
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  1. fn main() {
  2.     let my_string = String::from("hello world");
  3.  
  4.     // `first_word` works on slices of `String`s, whether partial or whole
  5.     let word = first_word(&my_string[0..6]);
  6.     let word = first_word(&my_string[..]);
  7.     // `first_word` also works on references to `String`s, which are equivalent
  8.     // to whole slices of `String`s
  9.     let word = first_word(&my_string);
  10.  
  11.     let my_string_literal = "hello world";
  12.  
  13.     // `first_word` works on slices of string literals, whether partial or whole
  14.     let word = first_word(&my_string_literal[0..6]);
  15.     let word = first_word(&my_string_literal[..]);
  16.  
  17.     // Because string literals *are* string slices already,
  18.     // this works too, without the slice syntax!
  19.     let word = first_word(my_string_literal);
  20. }
  21.  
  22. fn first_word(s: &str) -> &str {
  23.     let bytes = s.as_bytes();
  24.  
  25.     for (i, &item) in bytes.iter().enumerate() {
  26.         if item == b' ' {
  27.             return &s[..i];
  28.         }
  29.     }
  30.  
  31.     &s[..]
  32. }
  33.  
  34. fn first_word_bad(s: &String) -> usize {
  35.     let bytes = s.as_bytes();
  36.  
  37.     for (i, &item) in bytes.iter().enumerate() {
  38.         if item == b' ' {
  39.             return i;
  40.         }
  41.     }
  42.  
  43.     s.len()
  44. }
  45.  
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