jollopre

require 'logger'
logger = Logger.new(STDOUT, level: :INFO)

create_session = lambda do
  require 'bunny'
  Bunny.new({
    host: "rabbitmq",
    port: 5672,
    username: "guest",
    password: "guest",

prologic

Learn Go in ~5mins

This is inspired by A half-hour to learn Rust and Zig in 30 minutes.

Basics

Your first Go program as a classical "Hello World" is pretty simple:

First we create a workspace for our project:

jdarpinian

///bin/true;COMPILER_OPTIONS="-g -Wall -Wextra --std=c99 -O1 -fsanitize=address,undefined";THIS_FILE="$(cd "$(dirname "$0")"; pwd -P)/$(basename "$0")";OUT_FILE="/tmp/build-cache/$THIS_FILE";mkdir -p "$(dirname "$OUT_FILE")";test "$THIS_FILE" -ot "$OUT_FILE" || $(which clang || which gcc) $COMPILER_OPTIONS -xc "$THIS_FILE" -o "$OUT_FILE" || exit;exec "$OUT_FILE" "$@"
#include <stdio.h>

int main() {
  printf("Hello world!\n");
  return 0;
}

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

KronicDeth

Elixir Native UI - Boyd Multerer https://www.youtube.com/watch?v=77FW-jrCyCs

• Only dependencies are Elixir, Erlang, and glut to access OpenGL.
• No UI threads! Individual processes can be used to track mouse
• Slides track mouse as long as button is down https://youtu.be/77FW-jrCyCs?t=37m35s
• Sliders can be rotated https://youtu.be/77FW-jrCyCs?t=40m4s
• 500 lines animating still a few ms to render https://youtu.be/77FW-jrCyCs?t=43m34s

Thinking In Ecto - Darin Wilson https://www.youtube.com/watch?v=YQxopjai0CU

1. Repository pattern https://youtu.be/YQxopjai0CU?t=2m12s
2. Explicitness https://youtu.be/YQxopjai0CU?t=5m29s

lattner

Swift Concurrency Manifesto

Author: Chris Lattner

Chinese Translation by Jason Yu

Contents

• Introduction
• Overall Vision

pjambet

require 'minitest/autorun'
require 'pg'
require 'mysql2'
require 'sequel'

def get_db(database_name)
  case database_name
  when :pg
    Sequel.connect('postgres://pierre:@localhost:5432/pierre')
  when :mysql

rondy

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

nhusher

(ns reduxish.state-tools
  (:require-macros [cljs.core.async.macros :refer [go go-loop]])
  (:require [cljs.core.async.impl.protocols :refer [WritePort ReadPort]]
            [cljs.core.async :refer [<!]]))

(defn channel?
  "A predicate that determines if the provided thing is a core.async channel"
  [ch]
  (and (satisfies? WritePort ch) (satisfies? ReadPort ch)))

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent