johnynek

package org.bykn.list

import cats.Applicative

import cats.implicits._

/**
 * Implementation of "Purely Functional Random Access Lists" by Chris Okasaki.
 * This gives O(1) cons and uncons, and 2 log_2 N lookup.
 */

johnmcfarlane

begin(c++): Resources for C++ Beginners

General

• 🌏 The official ISO C++ Get Started! page

Primers

• 🎥 Herb Sutter: (Not Your Father’s) C++
• 🎥 Beginning with C++ by Jens Weller

jdegoes

package fpmax

import scala.util.Try
import scala.io.StdIn.readLine

object App0 {
  def main: Unit = {
    println("What is your name?")

    val name = readLine()

edolstra

This document contains some ideas for additions to the Nix language.

Motivation

The Nix package manager, Nixpkgs and NixOS currently have several problems:

• Poor discoverability of package options. Package functions have function arguments like enableFoo, but there is no way for the Nix UI to discover them, let alone to provide programmatic ways to

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

chrisdone

{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE LambdaCase #-}

-- | Print out the values of all names bound by statments,
-- either x <- y, or let x = y in a do-expression.
--
-- * Enable {-# LANGUAGE TemplateHaskell #-} in your module.
-- * Import Debug.Do
-- * Prefix bindings with _ to ignore them e.g. _foo.
--

djspiewak

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

3noch

:set prompt "> "
:set -isrc
:load Main

probonopd

Autodesk Fusion 360 on Linux

In the Web Browser

Ubuntu, Fedora, openSUSE, CentOS, SUSE Linux Enterprise, Debian,... users can finally use Autodesk Fusion 360 in the Linux Browser now.

https://myhub.autodesk360.com

On Chromium 55.0.2843.0 I get NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED.

andywer

This is a proposal for lightning talk at Reactive Conf. Please 🌟 this gist to push the proposal!

Memory Leak Testing in 2017

Hi, I am Andy, creator of leakage - the node-powered memory leak testing library.

Instead of manual debugging it provides a structured approach to fix or even prevent memory leaks.