Mastering Rust by Rahul Sharma

Author:Rahul Sharma
Language: eng
Format: epub
Publisher: Packt Publishing
Published: 2019-01-31T20:10:52+00:00

println!("Bytestring says {}", string_from_bytestring);

empty_string.push('1');

println!("1) Empty string now contains {}", empty_string);

empty_string.push_str("2345");

println!("2) Empty string now contains {}", empty_string);

println!("Length of the previously empty string is now {}",

empty_string.len());

}

With String explored, let's look at the borrowed version of strings known as string slices or the &str type.

Borrowed strings – &str

We can also have strings as references called string slices. These are denoted by &str (pronounced as stir), which is a reference to a str type. In constrast to the String type, str is a built-in type known to the compiler and is not something from the standard library. String slices are created as &str by default—a pointer to a UTF-8 encoded byte sequence. We cannot create and use values of the bare str type, as it represents a contiguous sequence of UTF-8 encoded bytes with a finite but unknown size. They are technically called unsized types. We'll explain unsized types later in this chapter.

str can only be created as a reference type. Let's assume we try to create a str type forcibly by providing the type signature on the left:

// str_type.rs

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