VARIABLES AND CONSTANTS

VARIABLES

• Variables in rust by default are immutable.

• let x = 42;

• You can make it mutable by adding mut like below example.

• let mut x = 42;
  x = 143;

• Once a data type is assinged it can't be changed, unless shadowing is used.

CONSTANTS

• Like immutable variables, constants are not allowed to change.
• They cannot be initialized as empty.
• Although variables can be assgined constant values, the vice versa is not possible.
• Wriiten using keyword const

• const DEFAULT_VALUE: &str = "Apple";

SHADOWING

• The ability to declare a new varible name multiple names.
• It allows to even change the data type of the variable like below given example.

• let age: f64 = 32.35;
  let age: &str = "grapes";