Swift-函数参数中的闭包

Question

I'm new to iOS and swift, trying to understand the basics. I tried the below two function calls in playground and I was expecting the result to be same but the first one returned one value and the second one returned two values.

Would you be able to explain me why?

func sqrt(a: Float) -> Float {
    return a * a
}

func avgOfSqrts(a: Float, b: Float, f: (Float -> Float)) -> Float {
    return (f(a) + f(b))/2
}

avgOfSqrts(2,3,sqrt) //returns 6.5

avgOfSqrts(2, 3, {x in return x * x}) //returns 4.0 and 9.0

shouldn't the function call with closure return 6.5 as well?

Thanks!

Answer 1

But the results are the same. You can try assign it to a var

var result = avgOfSqrts(2, 3, {x in return x * x})
result //this is 6.5 as expected