Data types in Rust
Learn what data types are available in Rust.
It also has two subsets: a scalar data type and a compound data type.
Rust is a statically typed language. It must know the data type of each variable at compile time.
A scalar type used for single value.
Rust has four scalar types (primary):
- floating-point numbers
- and characters.
Find more detail here
A compound types can represents group of multiple values.
Rust has 2 primitive compound types:
A group of values with different types can be compounded into a tuple.
- tuples have a fixed length (they can’t be change)
let tup: (i32, f64, u8) = (500, 6.4, 1); //explicit let tup = (500, 6.4, 1); //simple
How to get value from a tuple (destructing way)
let (x, y, z) = tup;
How to get value from a tuple (by index/index) by (name(dot)order)
let x: (i32, f64, u8) = (500, 6.4, 1); let five_hundred = x.0; let six_point_four = x.1; let one = x.2;
A group of values with same type.
- length is fixed
- It’s useful when you want data allocated on the stack rather than the heap (on other chapter)
How to declare an array
let a = [1, 2, 3, 4, 5]; //or let months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
If you want a flexible number of items (length can grow or shrink, use vector)
Declare array with same value
let a = [3; 5];
let a = [3, 3, 3, 3, 3];
How to access array element
Using the index in square bracket
let a = [1, 2, 3, 4, 5]; let first = a; let second = a;