what i learnt in Rust today

Ownership

It’s a set of rules every value has to follow for memory management

1. Each value has an owner.
2. There can only be one owner for a value at a given time.
3. Once the owner gets out of scope, value is dropped.

• drop: similar to C/C++ free() API

• shollow copy and deep copy:

  • rust by default does not create deep copy of a variable
  • use .clone() method to create deep copy on a variable

• passing a variable as a parameter to a function is similar to declairing a variable,

  • which means ownership of that variable is passed to that function, and it is no longer accessible to main function
  fn main() {
      let s = String::from("Hello");
  
      some_fu(s); // variable s ownerships is passed to some_fn()
  
      println!("{s}")  // s is no longer accessible here
    }
  
    fn some_fn(s: String){
        println!("{s}")
    }  // s is dropped here