==並行処理==
*https://developer.apple.com/jp/news/?id=2o3euotz
==ジェネリクス==
<pre>
func isEquals<T: Equatable> (_ x: T, _ y: T) -> Bool {
return x == y
}
print("\(isEquals("a", "b"))")
print("\(isEquals(1.0, 1.0))")
</pre>
===[https://ticklecode.com/swfitgdp/ ディスパッチキュー]===