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PE 2
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IEnumerable<int> fib() { | |
var s1 = 0; | |
var s2 = 1; | |
while (true) { | |
var o = s1 + s2; | |
s1 = s2; | |
s2 = o; | |
yield return o; | |
} | |
} | |
// this is prettier | |
Func<int,bool> isEven = i => i % 2 == 0; | |
Func<int,bool> under4Mill = i => i < 4000000; | |
var sum = fib().Where(isEven).TakeWhile(under4Mill).Sum(); | |
// this is the one liner | |
sum = fib().Where(i => i % 2 == 0).TakeWhile(i => i < 4000000).Sum(); | |
Console.WriteLine(sum); |
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def fib: Stream[Long] = { | |
def tail(h: Long, n: Long): Stream[Long] = h #:: tail(n, h + n) | |
tail(0, 1) | |
} | |
// pretty one | |
def even(i: Int) = i % 2 == 0 | |
def under4mill(i: Int) = i < 4000000 | |
fib filter even takeWhile under4mill sum | |
// one liner | |
fib filter (_ % 2 == 0) takeWhile (_ < 4000000) sum |
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