Computed var vs. non-void function with no arguments

[paulrolfe]

Which is better?

var heightForHeader: Float {
    return selectedSegment == .Upcoming ? 25 : 0
}

v.s. 

func heightForHeader() -> Float {
    return selectedSegment == .Upcoming ? 25 : 0
}

[giuggioRapido]

I vote for computed properties!

[alexpersian]

My vote goes to computed properties so long as they are simple. I came across this blurb from the Kotlin documentation that relates to this, and I think it applies well to Swift too.

Prefer a property over a function when the underlying algorithm:

• does not throw
• has a O(1) complexity
• is cheap to calculate (or caсhed on the first run)
• returns the same result over invocations