find the average of the log of primes in swift

main.swift
import Foundation

func isPrime(_ n: Int) -> Bool {
    if n < 2 { return false }
    for i in 2..<n {
        if n % i == 0 {
            return false
        }
    }
    return true
}

func primes(n: Int) -> [Int] {
    var result = [Int]()
    var i = 2
    while result.count < n {
        if isPrime(i) {
            result.append(i)
        }
        i += 1
    }
    return result
}

let primeNumbers = primes(n: 100)
let logPrimes = primeNumbers.map { log(Double($0)) }
let averageLog = logPrimes.reduce(0, +) / Double(logPrimes.count)
print("Average of log(primes) =", averageLog)
590 chars
29 lines