How do I conditionally execute code only when an Option is None?

If you are not interested in the value, just use

if v.is_none() { ... }

To check if an Option is None you can either use Option::is_none or use the if let syntax.

For example:

let x = ffunc();

if let None = x {
    println!("x is None")
}

Or using the Option::is_none function:

let x = ffunc();

if x.is_none() {
    println!("x is None")
}

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