Counts the average byte length in a unicode string. (lol)

lengthOfBytes.swift

// assuming utf-8 where characters are "normally" 1 byte (so the byte's default length is 8 bits.)

import Cocoa

func lengthOfBytes(s: String) -> Double {
    let count = Double(countElements(s))
    let bytes = Double(s.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
    let extra = (bytes - count) / count

    return 8 * (1.0 + extra)
}


lengthOfBytes("Hello🐶x") // -> ~11.429


lengthOfBytes("Hello✓x") // -> ~10.286


lengthOfBytes("Hello©") // -> ~9.333