Why We Chose Erlang over Java, Scala, Go, C

Machine Learning with Elixir and Phoenix

Communication Sequential Processes paper

Communication Sequential Processes paper

https://spinroot.com/courses/summer/Papers/hoare_1978.pdf

CSS related

https://blog.logrocket.com/firefox-devtools-for-css-authors-1511f41d1e3

git - get diff between 2 commits as a nice list of single-line commits

git log --oneline f9fff80..2b6e0da >> commits.txt

Erlang/Elixir related

Elixir/Erlang String handling - https://www.evanmiller.org/elixir-ram-and-the-template-of-doom.html
Advantages of using Erlang - https://www.evanmiller.org/why-i-program-in-erlang.html

Dave Thomas: Keynote at EMPEX Conference - May 31, 2018

https://elixirforum.com/t/should-we-adopt-daves-way-of-building-applications-as-a-series-of-components-daves-talk-has-now-been-added/14428/60

Elixir - Recursion

https://www.thebriandavis.com/posts/learning-elixir-recursion/

With Rails UJS, how to submit a remote form from a function

https://stackoverflow.com/questions/12683524/with-rails-ujs-how-to-submit-a-remote-form-from-a-function

tail + grep (multiple patterns)

https://stackoverflow.com/questions/23395665/tail-f-grep
https://unix.stackexchange.com/questions/37313/how-do-i-grep-for-multiple-patterns-with-pattern-having-a-pipe-character
https://stackoverflow.com/questions/7161821/how-to-grep-a-continuous-stream/7162898#7162898

Example: To grep for "Processing by" & "Parameters:" -
tail -f log/development.log | grep -E "Processing by|Parameters:"

Output:

2019-01-06 14:24:20.030 [INFO ] [30600:1788] Processing by Spree::ProductsController#index as JS

2019-01-06 14:24:20.031 [INFO ] [30600:1788]   Parameters: {"sort_scope"=>"default", "page"=>"12", "infiniteScroll"=>"true"}

Debounce in React

https://stackoverflow.com/questions/23123138/perform-debounce-in-react-js

React related

https://contextneutral.com/story/react-101-things-every-beginner-should-know?utm_source=js

SQL related

https://dankleiman.com/2019/01/02/stop-writing-sql-backwards/

Debounce function with args

https://stackoverflow.com/questions/23858046/debounce-function-with-args-underscore

Rails related - ActionView helpers in Assets Pipeline

https://stackoverflow.com/questions/14284278/how-to-include-actionview-helpers-in-the-assets-pipeline

Linux: Prevent SSH timeout

https://bjornjohansen.no/ssh-timeout

In ~/.ssh/config add the following line:

     ServerAliveInterval 30

This will send a “null packet” every 30 seconds on your SSH connections to keep them alive.

Write code that is easy to delete, not easy to extend.

https://programmingisterrible.com/post/139222674273/write-code-that-is-easy-to-delete-not-easy-to

Realtime Market-Data Updates with Elixir Share this

https://www.poeticoding.com/realtime-market-data-updates-with-elixir/?utm_source=reddit&utm_campaign=elixir

Elixir - how to kill a process or make it exit

https://elixirforum.com/t/how-do-i-kill-a-process-pid-0-186-0-in-iex/4491/8

Blazor

Advent of Code - Elixir

https://github.com/sasa1977/aoc
https://github.com/bjorng/advent-of-code-2018

https://elixirforum.com/tags/advent-of-code

Accessing view helpers in a Rails Console session

https://coderwall.com/p/s5sjqq/accessing-view-helpers-in-a-rails-runner-session

Phoenix LiveView discussion on elixirforum.com

https://elixirforum.com/t/phoenix-liveview-info/16569

Morphling - Similar to Phoenix LiveView, Drab

https://elixirforum.com/t/morphling-server-driven-dom-morphing-library-like-drab-liveview/18788
https://github.com/vans163/morphling

Difference between MultiCore Programming in Erlang and other languages

https://stackoverflow.com/questions/641326/what-is-the-difference-between-multicore-programming-in-erlang-and-other-language/641873#641873

http://erlang.org/download/armstrong_thesis_2003.pdf

https://en.wikipedia.org/wiki/Joe_Armstrong_(programmer)

argument solely by appeal to authority

https://research.swtch.com/dogma

...avoid argument solely by appeal to authority

ES6 - list of some of the new things

Some of the new things in ES6: 
destructuring, default parameter values, symbols, concise methods, computed properties, arrow functions, block scoping, promises, generators, iterators, modules, proxies, weakmaps, etc

Javascript - this, bind, call

// this , bind, call

var msg = "global";

function f(x){
  console.log(this.msg + "," + x);
}

var obj1 = {
  msg: "obj1",
  f: f
}

var obj2 = {
  msg: "obj2"
}

f(10);
obj1.f(10);
f.call(obj2, 10);

// f.call(window, 10);
// f.call(obj1, 10);
// f.call(obj2, 10);

// f.bind(obj1)(10)
// f.bind(obj2)(10)
// f.bind(window)(10)

Elixir - OptionParser

https://elixirforum.com/t/optionparser-and-cli/12083/5

Phoenix LiveView

https://dockyard.com/blog/2018/12/12/phoenix-liveview-interactive-real-time-apps-no-need-to-write-javascript

OpenAPI, Postman

https://github.com/OAI/OpenAPI-Specification

http://blog.getpostman.com/2018/12/11/postman-supports-openapi-3-0/

Build a Simple Persistent Key-Value Store in Elixir, using Logs

https://www.poeticoding.com/build-a-simple-persistent-key-value-store-in-elixir-using-logs-part-1/

https://www.poeticoding.com/build-a-simple-persistent-key-value-store-in-elixir-using-logs-part-2/

BEAM

https://www.reddit.com/r/elixir/comments/a1ss1b/what_actually_is_the_beam_slides_by_micha%C5%82_muska%C5%82a/

Elixir Case Studies

https://prograils.com/posts/why-discord-pinterest-moz-bleacher-report-use-elixir-case-studies

Erlang and Elixir coming to AWS Lambda

https://www.reddit.com/r/elixir/comments/a1qqjj/erlang_and_elixir_coming_to_aws_lambda/

Scoping of html classes (similar to React) in Phoenix?

https://www.reddit.com/r/elixir/comments/a24mcb/scoping_of_html_classes_similar_to_react_in/

Config in Elixir projects

Excerpt from Elixir Cookbook -

The configuration from the imported files will override any existing configuration (with the same key) in the config.exs file. In fact, Configuration values are merged recursively. See the example at https://github.com/alco/mix-config-example.
To access configuration values, we use Application.get_env(:app, :key). 

Redux - calling APIs

https://redux.js.org/advanced/asyncactions

https://redux.js.org/introduction/examples#real-world
https://codesandbox.io/s/github/reactjs/redux/tree/master/examples/real-world

https://redux.js.org/advanced/exampleredditapi

About Elixir

LMAX Disruptor concurrent framework

http://lmax-exchange.github.io/disruptor/files/Disruptor-1.0.pdf

React related: API calls when using Redux

https://www.reddit.com/r/reactjs/comments/4yesxn/api_calls_in_a_redux_app_best_practice/

AWS Cloud Development Kit

AWS re:Invent 2018: Infrastructure Is Code with the AWS Cloud Development Kit (DEV372)

https://www.reddit.com/r/programming/comments/a22fay/aws_infrastructure_as_code_using_aws_cdk/

Distributed Databases related - Citus & PostgreSQL

https://www.citusdata.com/blog/2018/11/30/why-rdbms-is-the-future-of-distributed-databases/
https://www.reddit.com/r/programming/comments/a1wwdh/why_the_rdbms_is_the_future_of_distributed/

The Benefits of Materialized Views (and how to use them in your Ruby on Rails project)

https://medium.com/@rebo_dood/the-benefits-of-materialized-views-and-how-to-use-them-in-your-ruby-on-rails-project-4ac1b5432881

Ruby map, each, collect, inject, reject, select quick reference

http://queirozf.com/entries/ruby-map-each-collect-inject-reject-select-quick-reference

Caching strategies in Phoenix

https://elixirforum.com/t/what-are-the-caching-strategies-in-phoenix/12351/4

Rails Performance related: Using nginx as Reverse Proxy Cache

https://mattbrictson.com/nginx-reverse-proxy-cache

PostgreSQL & Homebrew

https://stackoverflow.com/questions/15301826/psql-fatal-role-postgres-does-not-exist
If you're using postgres from Homebrew, then you want /usr/local/Cellar/postgresql/9.2.4/bin/createuser -s postgres (for version 9.2.4, obviously). 

Internationalization using Gettext in the Phoenix framework

https://sevenseacat.net/posts/2015/i18n-in-phoenix-apps/

memory_profiler for ruby

https://github.com/SamSaffron/memory_profiler
https://blog.skylight.io/hunting-for-leaks-in-ruby/
https://samsaffron.com

C++ book

http://www.informit.com/store/modern-c-plus-plus-design-generic-programming-and-design-9780201704310

Database Indexes - How to determine if an Index is required or not

https://dba.stackexchange.com/questions/56/how-to-determine-if-an-index-is-required-or-necessary
http://blog.celerity.com/how-to-design-sql-indexes

MIPA

 

22/08/2017, 19:03:36

B-Trees in databases are not binary trees, they are BALANCED trees

Server-side Swift for Java Developers

MySQL - importing JSON (and new feature related to it)

https://mysqlserverteam.com/import-json-to-mysql-made-easy-with-the-mysql-shell/
https://mysqlserverteam.com/importing-data-from-mongodb-to-mysql-using-python/

Reversing an immutable list

https://hackernoon.com/interview-question-reversing-an-immutable-list-in-java-57a891a521c5

UUID related

Seems like an exercise in trying to hack something using UUID guessing -

https://medium.com/@evinsellin/communicating-through-uuid-conflicts-fe50134304db

DoodleMaster - a UI Mocking Tool

https://github.com/karanchahal/DoodleMaster

Electron, Desktop PWAs

Medium article:
https://medium.com/dailyjs/goodbye-electron-hello-desktop-pwas-f316b8f39882


YouTube video:

Elixir learning resources

https://alchemist.camp/start
https://exercism.io/

RxJS Reactive Programming

https://sinxloud.com/explain-rxjs-reactive-programming/

Virtual Machines and Docker

http://zonov.me/achieving-continuous-delivery-part-2-virtual-machines-and-docker-explained/

gzip, tar

https://unix.stackexchange.com/questions/445897/unzipping-a-gz-file-to-get-a-text-file-but-getting-a-binary-file

gzip -d document.txt.gz

https://unix.stackexchange.com/questions/93139/can-i-zip-an-entire-folder-using-gzip

How to use “grep” command to find text including subdirectories

https://askubuntu.com/questions/55325/how-to-use-grep-command-to-find-text-including-subdirectories

grep -Hrn 'search term' path/to/files

MySQL Slow Queries

SELECT * FROM `mysql`.slow_log ORDER BY query_time DESC;

Database related - Composite Indexes

How do composite indexes work - https://stackoverflow.com/questions/795031/how-do-composite-indexes-work


https://stackoverflow.com/a/795068

Composite indexes work just like regular indexes, except they have multi-values keys.

If you define an index on the fields (a,b,c) , the records are sorted first on a, then b, then c.

Example:

| A | B | C |
-------------
| 1 | 2 | 3 |
| 1 | 4 | 2 |
| 1 | 4 | 4 |
| 2 | 3 | 5 |
| 2 | 4 | 4 |
| 2 | 4 | 5 |

shareimprove this answer

edited Apr 27 '09 at 20:50

answered Apr 27 '09 at 20:05

Rik

21.9k114561

• 12 Please note also that indexes are stored as Btree, so an (a,b,c) index will help on a search on (a) and on (a, b),
   but not on other searches like (b) or (b,c). – aexl Apr 30 '16 at 17:53

Two single-column indexes vs one two-column index in MySQL?

https://stackoverflow.com/a/2349824

"MySQL can use multiple-column indexes for queries that test all the columns in the index, or queries that test just the first column, the first two columns, the first three columns, and so on. If you specify the columns in the right order in the index definition, a single composite index can speed up several kinds of queries on the same table." - Multiple-Column Indexes – AlikElzin-kilaka Sep 9 at 4:46


https://stackoverflow.com/questions/2349817/two-single-column-indexes-vs-one-two-column-index-in-mysql
https://stackoverflow.com/questions/179085/multiple-indexes-vs-multi-column-indexes?rq=1

Phoenix related: Future of Drab & LiveView discussion

https://elixirforum.com/t/drab-and-liveview-community-oddities/16483/26
https://elixirforum.com/t/54-elixirconf-us-2018-closing-keynote-chris-mccord/16445/30

Reddit discussion - Let's talk about Phoenix.LiveView from Chris McCord's talk at ElixirConf 2018 US

https://www.reddit.com/r/elixir/comments/9e7n88/lets_talk_about_phoenixliveview_from_chris/

Blockchain 2018: Myths vs Reality

https://www.erlang-solutions.com/blog/blockchain-2018-myths-vs-reality.html?utm_source=Reddit&utm_campaign=BlockchainMythsvsReality2018

Elixir - How can I schedule code to run every few hours in Elixir or Phoenix framework?

https://stackoverflow.com/questions/32085258/how-can-i-schedule-code-to-run-every-few-hours-in-elixir-or-phoenix-framework

Algorithms related

Elixir - When to use Elixir language?

https://www.amberbit.com/blog/2018/5/15/when-to-use-elixir-language/

Ruby concurrency related

https://vaneyckt.io/posts/ruby_concurrency_in_praise_of_the_mutex/

labex.io - online courses with virtual environments

https://labex.io/courses

Has courses for Alibaba Cloud also.

up - tool for writing Linux pipes

https://github.com/akavel/up

up is the Ultimate Plumber, a tool for writing Linux pipes in a terminal-based UI interactively, with instant live preview of command results.

The main goal of the Ultimate Plumber is to help interactively and incrementally explore textual data in Linux, by making it easier to quickly build complex pipelines, thanks to a fast feedback loop. This is achieved by boosting any typical Linux text-processing utils such as grep, sort, cut, paste, awk, wc, perl, etc., etc., by providing a quick,interactive, scrollable preview of their results.

IronDB, EverCookie

https://github.com/gruns/irondb
https://github.com/samyk/evercookie

Internationalization - React vs Angular

https://hackernoon.com/internationalization-in-angular-and-react-applications-a-comparison-93883f4e1cdb

Make sure to read the comments too.

Rails: scopes

https://www.justinweiss.com/articles/how-to-preload-rails-scopes/

Phoenix related - LiveView, Drab, Texas - alternatives to using Frontend JS Frameworks

Drab:
https://elixirforum.com/t/drab-remote-controlled-frontend-framework-for-phoenix/3277

LiveView:
https://elixirforum.com/t/phoenix-liveview-info/16569

Texas:
https://gitlab.com/dgmcguire/texas

Erlang 'process'

https://www.quora.com/What-is-the-difference-between-system-threads-and-process-threads-as-in-Java-threads

Excerpt:

Erlang uses the term "process" because it does not expose a shared-memory multiprogramming model. Calling them "threads" would imply that they have shared memory.

Comparison of Erlang Runtime System and Java Virtual Machine

http://ds.cs.ut.ee/courses/course-files/To303nis%20Pool%20.pdf
https://www.javacodegeeks.com/2011/04/erlang-vs-java-memory-architecture.html
https://tech.labs.oliverwyman.com/blog/2006/09/10/erlang-processes-vs-java-threads/

Redis use cases

https://www.quora.com/Why-use-Redis-What-use-cases-is-it-good-for-and-why
https://www.quora.com/Is-Redis-an-alternative-to-a-database-Why-do-I-need-Redis-if-Im-using-a-MySQL-DB

Why Akka & Java versus Elixir/Erlang

http://qr.ae/TUGS10
https://www.quora.com/Why-should-we-reinvent-the-wheel-by-using-Akka-with-Java-if-we-have-Elixir-Erlang-ready-for-production

Elixir Intro

MySQL: Status variables in MySQL

https://stackoverflow.com/a/44856922

react-native-turbolinks

https://github.com/lazaronixon/react-native-turbolinks

Mongo - exporting and importing a single database

On Source Machine
-------------------------
mongo
> show dbs
> exit

mongodump -d abc_xyz_development

(Above command will create a dump/abc_xyz_development folder and put all the files inside it. This folder will need to be zipped and sent to whoever wants to import the database)

On Target Machine
-------------------------

Drop existing database
mongo

> show dbs

> use abc_xyz_development;
> db.dropDatabase();
> exit

Restore from Dump folder:
Command:
  mongorestore -d
E.g.
  mongorestore -d abc_xyz_development ~/abc_xyz_development