A tuple groups a fixed number of values in parentheses. Its values can have different types, and their positions are part of the tuple’s type. Use one when several values belong together but do not all have the same type. section 3.1.3 section 3.3
Read values by position
let details = ("cloudy", 8, 'a'); println!("{} {}", details.0, details.1); Positions start at 0. Use a dot to access an item: details.0 is "cloudy" and details.1 is 8. Unlike an array or vector, this tuple holds different types. section 3.1.3 section 3.1
You can also pull the items into separate variables: let (first, second, third) = ("one", "two", "three");. This is called destructuring. The pattern must have a place for every item; use _ for a position you do not need, as in let (_, second, third) = ("one", "two", "three");. section 3.1.3
Tuples work in match patterns, too: matching (sky, temperature) lets one arm check both values. The empty tuple, (), is called the unit type. A function that returns no other value returns (); a semicolon can make an otherwise unused expression produce that empty result. section 3.2.2 section 3.1.3
