0x04-Strings.md

Strings

• Primitive str - Immutable fixed-length string somewhere in memory. let hello = "hello";

• String - Growable , heap-allocated data structure

• Use when you need to modify or own string data. let hello = String::from("hello");

  • Get Length println!("String length {}", hello2.len());

  • Append a character hello2.push('W');

  • Append String hello2.push_str(", yeah!");

  • Capacity In Bytes println!("Capacity: {}", hello2.capacity());

  • Check If Its Empty println!("Is Empty: {}", hello2.is_empty());

  • Check if Contains println!("Contains: {}", hello2.contains("World"));

  • Replace println!("Replace: {}", hello2.replace("World", "There"));

  • Loop through string by splitting with white space.

  for word in hello2.split_whitespace(){
   println!("{}", word);
   }

  • Create string with a specified capacity

   let mut s = String::with_capacity(10);
   s.push('a');

• Assertion Testing

  assert_eq!(2,s.len());
  assert_eq!(10,s.capacity());