Boolean comparison causes extremely slow compilation

[phoneyDev (Stern)]

This question, or at least this answer, appears to come up frequently.

Swift equality operator takes long time to type check

I wanted to optimize compile time, so I had -Xfrontend -warn-long-expression-type-checking=200 flag on to figure out what causes long time to type check. Turns out == equality operators were causing long time to type check. So my question is.. Why does equality operator causes long time to type check? Is there an alternative way to compare equality? rather than explicity using == operator? And why would this way cause less compile time?

@DeskA Your method hasItems can be written on one line like this, however it will then exhibit the slow compilation I guess

return store.storage?.items.isEmpty == false

or you could try this

extension Optional where Wrapped == Bool {
	var isFalse: Bool {
		return self == false
	}
}

return (store.storage?.items.isEmpty).isFalse

You can also do it this way (but I don't like this style)

return store.storage?.items.isEmpty ?? false