[ob]

Rust noob here but couldn't you write

  if let Some(element) = some_vec.first() {
    println!("{}", element); 
    // .. more code
  }

and avoid the unwrap and the empty check?

Edit: Added a `let` I had forgotten.

[kccqzy]

Exactly (well other than "if let" here.)

Every time you have a Boolean if condition with an unwrap, it means you are not taking advantage of the type system.

[ob]

Thanks, added.

[muglug]

Yes, but IMO that makes the code a bit more abstract:

You've left behind an explicit "is this collection non-empty" and you're instead relying on a property of a non-empty collection.

The PHP version can also be written as

    if (($element = reset($some_arr)) !== null) {
        echo $element;
    }

But that code is similarly divorced from the imaginary pseudocode equivalent

[saghm]

> Yes, but IMO that makes the code a bit more abstract:

> You've left behind an explicit "is this collection non-empty" and you're instead relying on a property of a non-empty collection.

More abstract for who? I think virtually all Rust programmers would easily understand the `if let` snippet, virtually all PHP programmers would understand the PHP snippet, and virtually all programmers of any language would understand that a non-empty array has a first element. I'm not at all convinced that most programmers would correctly guess that a function called `reset` is used to access the first element in an array though.

[kccqzy]

A collection is non-empty if and only if it has a first element. Therefore checking for non-emptiness is the same as checking for the existence of a first element.