Initial data commit

Task/Population-count/Swift/population-count.swift

@@ -0,0 +1,25 @@
+func populationCount(n: Int) -> Int {
+  guard n >= 0 else { fatalError() }
+
+  return String(n, radix: 2).filter({ $0 == "1" }).count
+}
+
+let pows = (0...)
+    .lazy
+    .map({ Int(pow(3, Double($0))) })
+    .map(populationCount)
+    .prefix(30)
+
+let evils = (0...)
+    .lazy
+    .filter({ populationCount(n: $0) & 1 == 0 })
+    .prefix(30)
+
+let odious = (0...)
+    .lazy
+    .filter({ populationCount(n: $0) & 1 == 1 })
+    .prefix(30)
+
+print("Powers:", Array(pows))
+print("Evils:", Array(evils))
+print("Odious:", Array(odious))