Rust: String Vs str

What are the differences between Rust's `String` and `str`?

String is the dynamic heap string type, like Vec: use it when you need to own or modify your string data.

str is an immutable sequence of UTF-8 bytes of dynamic length somewhere in memory. Since the size is unknown, one can only handle it behind a pointer. This means that str most commonly appears as &str: a reference to some UTF-8 data, normally called a "string slice" or just a "slice".

Prefer &str as a function parameter or if you want a read-only view of a string.

String when you want to own and mutate a string.

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