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import scala.annotation.tailrec | |
import java.io.File | |
object FirstHomework extends App { | |
//homework sum 1 to n using recursion | |
def sumN(n: Int) = { | |
@tailrec | |
def sum(c: Int, acc: Int): Int = { | |
if(c == 0) acc |
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import scala.util.Try | |
object FirstWeek extends App { | |
lazy val lazy1 = 1 //evaluate once when needed | |
def lazy2 = 2 //evaluate when called | |
val eager = 3 //evaluate immediately | |
object Dog { | |
def name = { |
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var socket = null | |
function subscribe(channel) { | |
var subscribeUrl = jsRoutes.controllers.Application.subscribe().webSocketURL() + "?channel=" + channel | |
console.log("Subscribed to: " + subscribeUrl) | |
socket = new WebSocket(subscribeUrl) | |
socket.onmessage = function(event) { | |
$("#messages" ).prepend("<div>" + event.data + "</div>") | |
} | |
socket.onclose = function(event) { | |
console.log(event) |
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class SubscribeActor(redis: RedisClient, out: ActorRef, | |
channels: Seq[String] = Nil, patterns: Seq[String] = Nil) extends RedisSubscriberActor( | |
new InetSocketAddress(redis.host, redis.port), channels, patterns, | |
onConnectStatus = connected => { println(s"connected: $connected") }) { | |
def onMessage(message: Message) { | |
out ! message.data.decodeString("UTF-8") | |
} | |
def onPMessage(pmessage: PMessage) {} |
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class Application extends Controller { | |
... | |
implicit val akkaSystem = akka.actor.ActorSystem() | |
val redis = RedisClient() | |
def index = Action { implicit request => | |
Ok(views.html.pubsub()) |
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import org.openjdk.jmh.annotations.Benchmark; | |
import org.openjdk.jmh.annotations.BenchmarkMode; | |
import org.openjdk.jmh.annotations.Level; | |
import org.openjdk.jmh.annotations.Mode; | |
import org.openjdk.jmh.annotations.Param; | |
import org.openjdk.jmh.annotations.Scope; | |
import org.openjdk.jmh.annotations.Setup; | |
import org.openjdk.jmh.annotations.State; | |
@BenchmarkMode({Mode.Throughput}) |
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╔══════╦══════╦════════╗ | |
║ Col1 ║ Col2 ║ NumCol ║ | |
╠══════╬══════╬════════╣ | |
║ MMM ║ MMM ║ MMM ║ | |
║ 111 ║ 111 ║ 111 ║ | |
║ AAA ║ AAA ║ AAA ║ | |
╚══════╩══════╩════════╝ |
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Filter then sort then map then collect | |
+----------+-------------+---------+-------+ | |
| Language | Benchmark | Score | Error | | |
+----------+-------------+---------+-------+ | |
| Java | Collections | 13,615 | 255 | | |
| Java | Streams | 11,861 | 213 | | |
| Scala | Collections | 45,009 | 805 | <-- (3) | |
| Scala | Streams | 56,409 | 882 | <-- (2) | |
| Scala | Views | 139,639 | 2,875 | <-- (1) | |
+----------+-------------+---------+-------+ |
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Find first | |
+----------+-------------+------------+-----------+ | |
| Language | Benchmark | Score | Error | | |
+----------+-------------+------------+-----------+ | |
| Java | Collections | 80,444,836 | 1,358,358 | <-- (1) | |
| Java | Streams | 26,209,187 | 469,668 | | |
| Scala | Collections | 65,145,791 | 2,699,582 | <-- (3) | |
| Scala | Streams | 6,923,533 | 179,960 | | |
| Scala | Views | 58,082,123 | 1,004,918 | <-- (2) | |
+----------+-------------+------------+-----------+ |
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Map then reduce | |
+----------+-------------+------------+-------------+ | |
| Language | Benchmark | Score | Error | | |
+----------+-------------+------------+-------------+ | |
| Java | Collections | 10,989,113 | 319,941 | <-- (1) | |
| Java | Streams | 944,391 | 16,689 | <-- (2) | |
| Scala | Collections | 314,736 | 6,594 | | |
| Scala | Streams | 115,335 | 1,467 | | |
| Scala | Views | 476,832 | 9,358 | <-- (3) | |
+----------+-------------+------------+-------------+ |