Crystal предоставляет несколько литералов для создания значений определённых базовых типов.
| Литерал | Пример литерала |
|---|---|
| Nil | nil |
| Bool | true, false |
| Integers | 18, -12, 19_i64, 14_u32,64_u8 |
| Floats | 1.0, 1.0_f32, 1e10, -0.5 |
| Char | 'a', '\n', '♡' |
| String | "foo\tbar", %("♡"), %q(foo #{foo}) |
| Symbol | :symbol, :"foo bar" |
| Array | [1, 2, 3], [1, 2, 3] of Int32, %w(one two three) |
| Array-like | Set{1, 2, 3} |
| Hash | {"foo" => 2}, {} of String => Int32 |
| Hash-like | MyType{"foo" => "bar"} |
| Range | 1..9, 1...10, 0..var |
| Regex | /(foo)?bar/, /foo #{foo}/imx, %r(foo/) |
| Tuple | {1, "hello", 'x'} |
| NamedTuple | {name: "Crystal", year: 2011}, {"this is a key": 1} |
| Proc | ->(x : Int32, y : Int32) { x + y } |
| Command | `echo foo`, %x(echo foo) |