Variables, Immutability and Constants

• Variables. By default, variables are immutable.
  let x = 5;

• Variables mutable.
  let mut y = 5; y = 6;

• Shadowing
  let x = 6;

• Constants ( required data type, can't be changed, can't be shadowed) whatever scope
  const AGE: i32 = 23;

Type of data

Integers

• Signed i8, i16, i32, i64, i128, isize

• Unsigned u8, u16, u32, u64, u128, usize

Floating

• f32, f64

Boolean

• bool

Character

• char
• Single quotes ''

Compound Types

Tuple

• let tuple = ('a', 32, true);
• let (x, y, z) = tuple; assign each value of tuple
• let value1 = tuple.0 get first value of tuple

Array

• [i125:5] <type, size>
• let array = [1, 2, 5] fixed size

String

• let name = "kevin"
• let address: &'static str = "C 123"
• let lastName: String = "cuadros"