find the median from an array of doubles in swift

main.swift
func findMedian(_ arr: [Double]) -> Double {
    let sortedArr = arr.sorted()
    let middleIndex = sortedArr.count / 2

    if sortedArr.count % 2 == 0 {
        // even number of elements
        let middleElement1 = sortedArr[middleIndex - 1]
        let middleElement2 = sortedArr[middleIndex]
        return (middleElement1 + middleElement2) / 2
    } else {
        // odd number of elements
        return sortedArr[middleIndex]
    }
}
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main.swift
let arr: [Double] = [1.0, 2.0, 3.0, 4.0, 5.0]
let median = findMedian(arr) // median is 3.0
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