スレッド処理の同期化支援と言われる。 A synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes. CountDownLatch (Java Platform SE 8 )

! means “fire-and-forget”, e.g. send a message asynchronously and return immediately. Also known as tell. ドキュメントを読めばわかるかもですけど、メッセージを送ったらすぐにリターンする。もとはたぶん追尾ミサイルのfire and forgetで、ミサイル…

JSON is great… for computers. Even if it’s pretty-printed, trying to find relationships in the data is tedious. Human eyes, especially when looking at an ssh terminal, need compact and aligned text. The cat API aims to meet this need. All …