Integers 

  var a: i8   = -128;
var b: u8   = 255;
var c: i32  = -2_147_483_648;    -- underscores for readability
var d: u64  = 18_446_744_073_709_551_615;
var e: isize = -1;               -- pointer-sized signed
var f: usize = 0;                -- pointer-sized unsigned

Integer overflow always panics with plain arithmetic. Use explicit operators for other behavior:

  var x: u8 = 255;
var wrapped    = x +% 1;    -- wrapping: 0
var saturated  = x +| 1;    -- saturating: 255
-- x + 1 would panic

Floats 

  var a: f32 = 3.14;
var b: f64 = 2.718281828;

Booleans 

  var t: bool = true;
var f: bool = false;

if t and not f {
    debug.print("yes\n");
}

Logical operators are words: and, or, not, xor. Bitwise operators are symbols: &, |, ~, ^.

Characters and Strings 

  var c: char = 'A';              -- Unicode scalar value
var byte: u8 = 65;              -- a byte

-- strings are slices of bytes
var s: []const u8 = "hello";
var owned = try String::from(alloc, "hello");   -- heap-allocated UTF-8

Iterating a string:

  for b in s.bytes()      { -- b: u8, raw bytes   }
for c in s.codepoints() { -- c: char, codepoints }

The Unit Type 

  fn doSomething(): void {
    debug.print("done\n");
    -- implicit return of void
}