swift - syntax, == operator when not in if statement. -

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i came across line of code 

let shouldexpandwindow = self.itemsoffset + self.items.count == self.windowoffset + self.windowcount

i'm not used seeing == outside of if statement. know it's meant comparisons. how work in case. thank

== function takes 2 values of same type (such int) , returns bool. example, if comparing 2 ints, function signature is:

func ==(lhs: int, rhs: int) -> bool

the result of comparison assigned shouldexpandwindow swift infers have type bool.

you can find out option-clicking on ==:

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