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let

The let keyword introduces a variable binding. Variables declared with let are mutable by default.

Syntax & Example​

let name = "Alice";        // inferred string
let count: i32 = 100;      // explicit type
let counter = 0;           // reassignable
counter += 1;
// Multi-binding and destructuring
let x, y = 10, 20;
let (a, b) = point;

Use Cases​

  • Declaring local and scoped variables.
  • Binding pattern-match results and tuple unpacks.
  • Shadowing an earlier binding with a transformed value or type.

See also: Variables & Mutability.