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.