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const

The const keyword declares a value that is evaluated at compile time. Constants require an explicit type annotation and may appear at global or local scope.

Syntax & Example​

const MAX_BUFFER_SIZE: usize = 1024 * 1024;
const DEFAULT_TIMEOUT: u64 = 30;
const APP_NAME: string = "AdeshServer";

Use Cases​

  • Defining fixed configuration values used across the program.
  • Eliminating magic numbers by giving them named, typed constants.
  • Allowing the compiler to fold the value into every use site.

See also: Variables & Mutability.