Options in Rust
The Option<T> enum in Rust can cater to two variants:
None: represents a lack of value or if an error is encounteredSome(value): value with typeTwrapped in a tuple
Code
Let’s look at a case where the Option enum could come in handy. The work_experience function below uses a match operator to return either values or a None object based on a person’s occupation.
fn work_experience(occupation: &str) -> Option<u32>{match occupation{"Junior Developer" => Some(5),"Senior Developer" => Some(10),"Project Manager" => Some(15),_ => None}}fn main() {println!("Years of work experience for a junior developer: {}", match work_experience("Junior Developer"){Some(opt) => format!("{} years", opt),None => "0 years".to_string()});println!("\nYears of work experience for a student: {}", match work_experience("Student"){Some(opt) => format!("{} years", opt),None => "0 years".to_string()});}
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