Ruby

Rails on Docker и Test Drive Your Dockerfiles with RSpec and ServerSpec
Different Methods for Merging Ruby Hashes, Why attr_accessor is 3x faster than getters and setters, and 8x faster than define_method и The Life of an HTTP Request in Rails
Life Beyond Rails: A Brief Look at Alternate Web Frameworks for Ruby и Using PostgreSQL and jsonb with Ruby on Rails
Predicting Test Failures и RSpec-Varys — a plugin to RSpec-Mocks that generates new specs for any unverified calls to test-doubles
Why doesn’t my code work outside of Rails? и What is Rack?

JavaScript

HTTP/2 Proposed Standard и RSCSS — Reasonable Standard for CSS Stylesheet Structure
Introduction to Facebook’s Flux architecture и Introducing Relay and GraphQL
Terrible JavaScript Mistakes To Avoid With A Static Code Analyzer и Solving common node/io.js callback problems
Vega: A Visualization Grammar, DarkLord — NodeJS Authentication Solution и JS2PNG — hide Javascript code inside PNG images
DefiantJS — perform lightning-fast searches on JSON using XPath expressions, ItemSlide.js — a simple and beautiful touch carousel и Memory-stats.js — minimal monitor for JS Heap Size via performance.memory