Using the Swift if let with logical AND operator &&

Question

We know that we can use an if let statement as a shorthand to check for an optional nil then unwrap.

However, I want to combine that with another expression

Answer 1

Max's answer is correct and one way of doing this. Notice though that when written this way:

if let a = someOptional where someBool { }

The someOptional expression will be resolved first. If it fails then the someBool expression will not be evaluated (short-circuit evaluation, as you'd expect).

If you want to write this the other way around it can be done like so:

if someBool, let a = someOptional { }

In this case someBool is evaluated first, and only if it evaluates to true is the someOptional expression evaluated.