Structs - Easy Rust

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• The third type is the named struct. This is probably the most common struct.

• Structs

• With structs, you can create your own type.

• You will use structs all the time in Rust because they are so convenient. Structs are created with the keyword struct. The name of a struct should be in UpperCamelCase (capital letter for each word, no spaces). If you write a struct in all lowercase, the compiler will tell you.

• There are three types of structs.

• One is a "unit struct". Unit means "doesn't have anything". For a unit struct, you just write the name and a semicolon.

• struct FileDirectory;

• The next is a tuple struct, or an unnamed struct. It is "unnamed" because you only need to write the types, not the field names.

• Tuple structs are good when you need a simple struct and don't need to remember names.

• struct Colour(u8, u8, u8);

• let my_colour = Colour(50, 0, 50); // Make a colour out of RGB (red, green, blue)

• Note that you don't write a semicolon after a named struct, because there is a whole code block after it.

• In this struct you declare field names and types inside a {} code block.

• struct SizeAndColour { size: u32, colour: Colour, // And we put it in our new named struct }

• If the field name and variable name are the same, you don't have to write it twice.

• struct Country { population: u32, capital: String, leader_name: String }

• Did you notice that we wrote the same thing twice? We wrote population: population, capital: capital, and leader_name: leader_name. Actually, you don't need to do that

• let population = 500_000; let capital = String::from("Elista"); let leader_name = String::from("Batu Khasikov"); let kalmykia = Country { population, capital, leader_name, };