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Option

Rust can have a piece of data that might have a value (Some), or not (None), with Option.

Option should NOT be used as a return value/type… but nothing except bad practices will stop you.

Instead of returning a Option use Result

Typically Option is found when defining a structure of data…

struct User {
    name: String,
    email: Option<String>,
    age: Option<u32>,
}

User above will have a name, but might not have email or age.

let u: User = User{
    name: "Apollo".to_string(),
    email: Some("[email protected]".to_string()),
    age: None
};

The above shows how to assign something (Some) to an Option, and nothing (None) to another Option.

Check out my if let post to know how to access email and age


2024-09-12