TIL

Today I Learned

A collection of concise write-ups on small things I learn day to day across a variety of languages and technologies.

Inspired by Josh Branchaud's til.

Categories

• Elixir
  • ExUnit
  • Phoenix framework
• Erlang
• Git
• Linux
• Mac
• Postgres
• Shell scripting

Elixir

• Distributed Erlang
• Distributed Erlang sync nodes
• Dynamic supervisor start children
• Ecto stream to list
• Ecto Repo's connection process
• Ecto virtual field
• Error handling in Elixir libraries
• Exception message
• External resource module attribute
• Graceful shutdown
• GenServer hibernate after start option
• GenServer name registration using :via option
• Install Elixir and Erlang with asdf version manager
• Pattern match struct name
• Postgrex copy from STDIN
• Process links
• Running Observer on a remote node deployed with Distillery
• Read from the application's directory
• Remove unused dependencies from mix.lock
• Revert Hex package
• Rollbar exception reporting for Phoenix
• Running Ecto database migrations during deployment
• Start an Elixir application's dependencies
• Testing plugs
• Travis CI Ecto migrations
• Use Ecto's UTC datetime type
• Use monotonic time for timing

ExUnit

• ExUnit assert match
• ExUnit capture log level
• ExUnit ignore tests

Phoenix framework

• Page specific titles

Erlang

• Erlang version

Julia

• Getting started with Julia

Git

• Rebase root git commit
• Set origin URL
• Syncing a GitHub fork

Linux

• systemd service configuration

macOS

• Increase open file limit
• macOS sleep and wake

Postgres

• Formatting timestamps
• Gapless sequence in Postgres
• Install TimescaleDB with Postgres.app
• List tables in a Postgres schema
• Recreate Postgres schema

Shell scripting

• Exit codes