Literals

Literals are the simplest way to write values directly in source code: numbers, booleans, chars, strings, durations, and aggregates like arrays struct literals.

This wiki page is a learning-oriented companion to the canonical spec: literals overview.

Notes#

Detailed rules and edge cases: docs/language/literals-*.md

Syntax#

let n: int = 42;
let pi: f64 = 3.14159;
let ok: bool = true;
let c: char = '\\n';
let s: string = "hello";

// Duration literals
let d: Duration = 10ms;

// Aggregates
let xs: int[3] = [1, 2, 3];
// let p: Point = Point{ x: 1, y: 2 };

Examples#

Example: array literal + indexing#

fn main () -> int {
  let xs: int[3] = [10, 20, 30];
  return xs[1];
}

Example: multiline strings#

import std::io;

fn main () -> int {
  std::io::println(`line1
line2`);
  return 0;
}