Strings. The two most used string types in Rust are String and &str.. A String is stored as a vector of bytes (Vec), but guaranteed to always be a valid UTF-8 sequence.String is heap allocated, growable and not null terminated. &str is a slice (&[u8]) that always points to a valid UTF-8 sequence, and can be used to view into a String, just like &[T] is a view into Vec..

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Individual character access is an O (n) operation because of UTF-8, so I imagine that the decision to remove indexing was intended to discourage doing this operation repeatedly on a string. Instead, you should collect the .chars() iterator into a Vec . 23.. Char-based indexing can't be constant-time, but getting the char at a byte index could be. It just needs to panic or return Option in case your index is a UTF-8 continuation. 3 Likes. eminence February 1, 2018, 10:29pm 4. If you want the byte at a given offset, that is indeed constant time: let byte: u8 = my_string.as_bytes()[i];