joeytwiddle

Do not use forEach with async-await

TLDR: Use for...of instead of forEach() in asynchronous code.

For legacy browsers, use for...i or [].reduce()

To execute the promises in parallel, use Promise.all([].map(...))

The problem

schweigert

I am passionate about Ruby, but its execution time compared to other languages is extremely high, especially when we want to use more complex algorithms. In general, data structures in interpreted languages become incredibly slow compared to compiled languages. Some algorithms such as ´n-body´ and ´fannkuch-redux´ can be up to 30 times slower in Ruby than Go. This is one of the reasons I was interested in embedding Go code in a Ruby environment.

For those who do not know how shared libraries operate, they work in a similar way as DLLs in Windows. However, they have a native code with a direct interface to the C compiler.

Note Windows uses the DLL system, and in this case, this does not necessarily have to be in native code.

One example is DLLs written in C#, which runs on a virtual machine. Because I do not use windows, I ended up not testing if it is poss

nerevar

import json
import uuid
from IPython.display import display_javascript, display_html, display

class RenderJSON(object):
    def __init__(self, json_data):
        if isinstance(json_data, dict) or isinstance(json_data, list):
            self.json_str = json.dumps(json_data)
        else:
            self.json_str = json_data

woudsma

TLS secured TCP exposed Docker daemon on Dokku host - setup

1. Create certificates
2. Edit Docker options
3. Restart Docker
4. Copy client certificates from host
5. (optional) Add remote endpoint in Portainer

Tested on a standard $5/mo DigitalOcean VPS running Ubuntu 16.04.

---

przbadu

Setup Rails and Vuejs

1. Generate new rails app using --webpack flag

rails new myApp --webpack=vue

Note:

1. You can use --webpack=angular for angular application and --webpack=react for react.

rushilgupta

INTRO

Concurrency is a domain I have wanted to explore for a long time because the locks and the race conditions have always intimidated me. I recall somebody suggesting concurrency patterns in golang because they said "you share the data and not the variables".

Amused by that, I searched for "concurrency in golang" and bumped into this awesome slide by Rob Pike: https://talks.golang.org/2012/waza.slide#1 which does a great job of explaining channels, concurrency patterns and a mini-architecture of load-balancer (also explains the above one-liner).

Let's dig in:

Goroutines

StevenACoffman

MicroService Proxy Gateway Solutions

Kong, Traefik, Caddy, Linkerd, Fabio, Vulcand, and Netflix Zuul seem to be the most common in microservice proxy/gateway solutions. Kubernetes Ingress is often a simple Ngnix, which is difficult to separate the popularity from other things.

Github Star Trend:

This is just a picture of this link from March 2, 2019

Originally, I had included some other solution

remi

#!/usr/bin/env bash

# This script requires `curl`, `jq`, `xargs` `bc` and `awk`

add_arrows() {
  foo=$(echo $1 | sed -e 's/^\([0-9]\)/▲ \1/g')
  foo=$(echo $foo | sed -e 's/^-/▼ /g')
  echo $foo
}

EwanValentine

#!/bin/bash
source ~/.bashrc

echo "Building"

# Build Go binary in Docker image
docker run --rm \
	-e "GOPATH=/go" \
	-e "CGO_ENABLED=0" \
	-e "GOOS=linux" \

mankind

http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")