'if let where' alternative

[Bruno Berisso]

Hi all.

I'm facing this kind of expressions quite frequently:

if let unwrappedValue = someExpensiveOperation() where unrelatedCondition {
    ...
}

This kind of if let expression always executes someExpensiveOperation before check the where clause. The obvious approach here is move the unrelatedCondition to an external if like:

if unrelatedCondition {
    if let unwrappedValue = someExpensiveOperation() {
        ...
    }
}

There is another way to write this?

[Chris Lattner]

Hi Bruno,

You should be able to use:

if unrelatedCondition, let unwrappedValue = someExpensiveOperation() {

}

-Chris

[Bruno Berisso]

Right,

I was trying the same with '&&' instead of ','

Thanks