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70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
// ./src/std/str.md
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fn part0() {
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// (all the type annotations are superfluous)
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// A reference to a string allocated in read only memory
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let pangram: &'static str = "the quick brown fox jumps over the lazy dog";
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println!("Pangram: {}", pangram);
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// Iterate over words in reverse, no new string is allocated
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println!("Words in reverse");
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for word in pangram.split_whitespace().rev() {
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println!("> {}", word);
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}
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// Copy chars into a vector, sort and remove duplicates
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let mut chars: Vec<char> = pangram.chars().collect();
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chars.sort();
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chars.dedup();
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// Create an empty and growable `String`
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let mut string = String::new();
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for c in chars {
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// Insert a char at the end of string
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string.push(c);
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// Insert a string at the end of string
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string.push_str(", ");
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}
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// The trimmed string is a slice to the original string, hence no new
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// allocation is performed
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let chars_to_trim: &[char] = &[' ', ','];
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let trimmed_str: &str = string.trim_matches(chars_to_trim);
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println!("Used characters: {}", trimmed_str);
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// Heap allocate a string
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let alice = String::from("I like dogs");
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// Allocate new memory and store the modified string there
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let bob: String = alice.replace("dog", "cat");
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println!("Alice says: {}", alice);
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println!("Bob says: {}", bob);
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}
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fn part1() {
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// You can use escapes to write bytes by their hexadecimal values...
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let byte_escape = "I'm writing \x52\x75\x73\x74!";
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println!("What are you doing\x3F (\\x3F means ?) {}", byte_escape);
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// ...or Unicode code points.
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let unicode_codepoint = "\u{211D}";
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let character_name = "\"DOUBLE-STRUCK CAPITAL R\"";
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println!("Unicode character {} (U+211D) is called {}",
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unicode_codepoint, character_name );
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let long_string = "String literals
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can span multiple lines.
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The linebreak and indentation here ->\
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<- can be escaped too!";
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println!("{}", long_string);
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}
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pub fn main() {
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part0();
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part1();
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}
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