A vector in Rust is an array that can grow dynamically, allowing new elements to be added at runtime. It can store multiple values of the same type and is represented by the Vec<T>
notation, where T
denotes the vector type.
u8
A vector of u8
is a data structure in Rust that represents a sequence of bytes. The u8
type in Rust represents an unsigned 8-bit integer that can hold values between 0
and 255
. Therefore, a vector of u8
can store a sequence of bytes with values ranging from 0
to 255
. Here's an example of how to create a vector of u8
in Rust:
// create a vector of u8 byteslet mut bytes: Vec<u8> = vec![72, 101, 108, 108, 111]; // represents "Hello" in ASCII
string
To convert a vector of u8
bytes to a string
in Rust, we can use the String::from_utf8()
method.
fn main() {let my_vec: Vec<u8> = vec![72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]; // "Hello World" in ASCIIlet vec_to_string = String::from_utf8(my_vec).unwrap(); // Converting to stringprintln!("{}", vec_to_string); // Output: Hello World}
Line 2: We create and initialize a vector my_vec
with "Hello World" in ASCII using the vec!
macro method.
Line 3: We call the String::from_utf8()
method and pass my_vec
as an argument. This method returns a Result
type, which we can unwrap to get the resulting string
and store it in the vec_to_string
variable.
Line 4: We print the vec_to_string
.
The method will return an error if the bytes vector contains invalid UTF-8
sequences. In the example above, we're using the unwrap()
method to detect if there's an error. In the production stage, handling the error gracefully is usually better.
Free Resources