String Literal

String Both have different ownership and mutability characteristics. String literal: string local variable, stored on stack

let a:string = "test";
            

Operations on String

/////////////  Concatenate /////////////////////////
// push_str()
let s2 = String::from("Hello");
s2.push_str(" World");                       //push_str() appends string.
s2.push(' k');                               //push() appends 1 character

// +
let s1 = String::from("Test");
let s2 = String::from("Foo");
let s3 = s1 + &s2;             //Why reference. Operator + uses add method `fn add(self, s: &str) -> String {..}`
//println!("{}",s1);           //Since s1 is moved not copied

// format()
let s1 = String::from("Test");
let s2 = String::from("Foo");
let s3 = format!("{} {}",s1,s2);            //Test Foo  

///////////// Reverse the string ////////////////
strA = strA.chars().rev().collect::<String>();      

///////////// Tokenize ////////////////////
let a = "40:20".to_string();
let vec:Vec <&str> = a.split(':').collect();

//////////// Conversion //////////////////
let a = my_string.parse::<i32>().unwrap();      //string to int
let mut strA = a.to_string();                       //int to string

/////////// Print Characters ////////////
let hello = "Здравствуйте";
for a in hello.chars() {
    println!("{}",a)
}