Rust: Variables and Immutability

Status: Courses

1. Declare variables using let

   #![allow(unused)]
   fn main() {
   // Declare variable with auto-assign type
   let var = 0;
   // Declare variable with defined type
   let var: i32 = 0
   }

2. By default, values in these variables cannot be changed or reassigned. So they are called immutable.

3. To declare variables that can change you need to use mut keyword

   #![allow(unused)]
   fn main() {
   // Declare variable with mut keyword
   let mut var = 0; 
   }

4. Variables with mut can change or re-assign their values.