rust armanriazi strring vs str
In Rust, the String
and str
types represent different ways of working with strings.
The String
type is a mutable, growable UTF-8 encoded string. It is allocated on the heap and allows you to modify its contents. You can create a String
by using the String::new()
function or by converting a string literal using the String::from()
function. You can concatenate strings using the +
operator or the String::push_str()
method.
The str
type, also known as a string slice or a string reference, is an immutable sequence of Unicode scalar values. It is a borrowed type that points to a sequence of bytes in memory. String literals in Rust have the type &str
. You can create a str
from a string literal or from a String
using the &
operator.
Here's an example that demonstrates the difference between String
and str
:
fn main() {
let s1: String = String::from("Hello"); // s1 is a String
let s2: &str = &s1; // s2 is a string slice
println!("s1: {}", s1);
println!("s2: {}", s2);
}
In this example, s1
is a String
that owns the string data, while s2
is a &str
that references the string data in s1
. The println!
macro can print both String
and str
types.
It's important to note that String
and str
have different memory characteristics. String
is allocated on the heap and can be resized, while str
is a borrowed type and does not have ownership or the ability to modify its contents.
I hope this clarifies the difference between String
and str
in Rust.