86 lines
1.2 KiB
Markdown
86 lines
1.2 KiB
Markdown
# String.
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# Types.
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## String (owned).
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Those are familiar strings.
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```rust
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let text: String = String::from("Text!");
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let text: String = "Text!".to_string();
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```
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## &str (slice).
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Those are slices.
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```rust
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let text: &str = "Text!";
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let text: String = "Text!".to_string();
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let ref: &str = &text;
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```
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# Operations.
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## Append.
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```rust
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let mut s = String::from("foo");
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s.push_str("bar");
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```
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## Format.
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```rust
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let s1 = String::from("tic");
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let s2 = String::from("tac");
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let s3 = String::from("toe");
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let s = format!("{s1}-{s2}-{s3}");
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```
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## Trim.
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```rust
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fn trim_me(input: &str) -> String {
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input.trim().to_string()
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}
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```
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## Replace.
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```rust
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fn replace_me(input: &str) -> String {
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input.replace("cars", "balloons").to_string()
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}
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```
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## Slice.
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```rust
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let s = String::from("Здравствуйте");
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let s = &s[0..4]; // Content is "Зд" - first 4 bytes (2 bytes per letter).
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```
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## Iterate.
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```rust
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// Iterate over UTF character vector.
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for c in "Зд".chars() {}
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// Iterate over UTF bytes.
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for c in "Зд".bytes() {}
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// To iterate over UTF letters you need to use an external crate.
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```
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## Uppercase / Lowercase.
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```rust
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let s = String::from("Hi there!");
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let uppercase = s.to_uppercase();
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let lowercase = s.to_lowercase();
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```
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