CODEWITHSUNDEEP
rust
Muhammad Lukman Low
Muhammad Lukman Low

Reputation: 8533

unwrap_or in rust that returns two values?

How do I write a function like this:

pub fn unwrap_some_or_none_with_error(input: Option<&'static str>) -> &str {
    input.unwrap_or(0)
}

So that when None is sent to this function it will return 0, and when an Option like Some is sent it unwraps it ?

Upvotes: 0

Views: 407

Answers (1)

Jmb
Jmb

Reputation: 23434

That's not possible: Rust is a typed language so everything can only have a single type. The idiomatic way to do what you describe is to use a Result, which can hold either a value or an error. This Result can be created with ok_or:

pub fn unwrap_some_or_none_with_error(input: Option<&'static str>) -> Result<&str, i32> {
    input.ok_or(0)
}

Upvotes: 1

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