Primitives
Rust provides access to a wide variety of primitives
. A sample includes:
Scalar Types
- Signed integers:
i8
,i16
,i32
,i64
,i128
andisize
(pointer size) - Unsigned integers:
u8
,u16
,u32
,u64
,u128
andusize
(pointer size) - Floating point:
f32
,f64
char
Unicode scalar values like'a'
,'α'
and'∞'
(4 bytes each)bool
eithertrue
orfalse
- The unit type
()
, whose only possible value is an empty tuple:()
Despite the value of a unit type being a tuple, it is not considered a compound type because it does not contain multiple values.
Compound Types
- Arrays like
[1, 2, 3]
- Tuples like
(1, true)
Variables can always be type annotated. Numbers may additionally be annotated
via a suffix or by default. Integers default to i32
and floats to f64
.
Note that Rust can also infer types from context.
See also:
the std
library, mut
, inference
, and
shadowing