CODEWITHSUNDEEP
rust
Tynkute
Tynkute

Reputation: 41

Why is rust expecting () when it should bool?

My rust code should return a boolean value, but for some reason, () is expected. What's the matter here?

fn create_file(path: &Path) -> bool {
    // if file already exist
    if path.is_file(){
        false
    }
    let mut file = File::create(path);
    true
}

Error:

error[E0308]: mismatched types
--> src/main.rs:53:9
    |
 52 | /     if path.is_file(){
 53 | |         false
    | |         ^^^^^ expected `()`, found `bool`
 54 | |     }
    | |     -- help: consider using a semicolon here
    | |_____|
    |       expected this to be `()`

but if you add ";" after false, then everything still works.

Upvotes: 1

Views: 569

Answers (1)

Netwave
Netwave

Reputation: 42678

You are missing the return or the else. Using else will make the if/else block to be the return expression

fn create_file(path: &Path) -> bool {
    // if file already exist
    if path.is_file(){
        false
    } else {
        let mut file = File::create(path);
        true
    }
}

Upvotes: 5

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