rxwei

See the official Differentiable Programming Manifesto instead.

tomwhoiscontrary

import com.sun.net.httpserver.Filter;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.util.Arrays;
import java.util.List;

djspiewak

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

cbeyls

Function	Function type	Target passed as	Returns
also	Extension	it	Target
apply	Extension	this	Target
let	Extension	it	Block return value
run	Extension	this	Block return value
with	Regular	this	Block return value

elizarov

class Result<T> private constructor(private val result: Any?) {
    // discovery

    val isFailure: Boolean get() = result is Failure
    val isSuccess: Boolean get() = result !is Failure

    // value retrieval

    fun get(): T =
        if (result is Failure) throw result.exception

thomasnield

// Bring in Google Guava as a dependency
// compile 'com.google.guava:guava:22.0'


import com.google.common.base.CaseFormat
import java.sql.ResultSet


fun ResultSet.toDataClass(): String {

hastebrot

import org.gradle.api.file.SourceDirectorySet
import org.gradle.api.internal.HasConvention
import org.gradle.api.tasks.SourceSet
import org.gradle.api.tasks.SourceSetContainer
import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

//—————————————————————————————————————————————————————————————————————————————————————————————————
// BUILD SCRIPT.
//—————————————————————————————————————————————————————————————————————————————————————————————————

boyter

/*
Three people are playing the following betting game.
Every five minutes, a turn takes place in which a random player rests and the other two bet
against one another with all of their money.
The player with the smaller amount of money always wins,
doubling his money by taking it from the loser.
For example, if the initial amounts of money are 1, 4, and 6,
then the result of the first turn can be either
2,3,6 (1 wins against 4);
1,8,2 (4 wins against 6); or

dain

# To regenerate the test key and certificates

# Generate an RSA private key and convert it to PKCS8 wraped in PEM
openssl genrsa 2048 | openssl pkcs8 -topk8 -inform pem -outform pem -nocrypt -out rsa.key
# Generate a certificate signing request with the private key
openssl req -new -key rsa.key -out rsa.csr
# Sign request with private key
openssl x509 -req -days 10000 -in rsa.csr -signkey rsa.key -out rsa.crt

kulshekhar

import 'dart:html';
import 'package:angular2/core.dart';
import 'package:angular2/router.dart';

@Component(
  selector: 'my-app',
  styleUrls: const ['app_component.css'],
  template: '''
  <h1>My First Angular 2 App</h1>