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. Sometimes I find them by knowing what I'm
looking for. Other times I go looking for anything that will help. Most times I
end up saying "neat" and creating an entry.

These TILs are a mix between "this is a useful thing that I learned that could
help others" and "this is something really annoying that took forever to find
out and I know I'll come across it again at some point so I want it committed
for posterity".

80 TILs across 21 categories and growing!

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Categories

• C++
• CSS
• Elixir
• git
• JavaScript
• MySQL
• nginx
• Node.js
• node.js
• PostgreSQL
• Powershell
• Python
• Rails
• ripgrep
• Ruby
• Rust
• TypeScript
• Unix
• vim
• VS Code
• WebAssembly

---

C++

• Scoped enums

CSS

• Underline offset

Elixir

• Base encoding methods
• Get last value in IEx
• Inspect with labels
• Maximum integer size
• Releases
• Test coverage
• Test setup
• Turn on history in IEx

git

• Avoiding git-checkout
• Copy file between branches
• Find file creation date
• Get list of commits between two tags
• Getting file from another branch
• Push commit with tags
• Set commit message editor
• Sync deleted remote branches

JavaScript

• Chunking a string
• ESLint debug output
• Regular expression flags
• Regular expression non-capture groups

MySQL

• Getting last inserted id

nginx

• Redirect requests to new domain

Node.js

• Buffer.concat
• Dirents
• File system flags in Node
• High resolution timer
• Processing PDF files
• Random integers
• Readable stream async generator
• Readline interface
• Readline interface 2

node.js

• unref a timer

PostgreSQL

• EXCEPT keyword
• Filter clause
• Finding next primary key for table
• Finding public table names
• Grouping sets
• with clauses

Powershell

• Tailing a file

Python

• Finding available methods for class

Rails

• Active record attributes
• select vs pluck

ripgrep

• List files

Ruby

• squeeze

Rust

• include_str!
• Option into Result
• Ranges with a custom step
• Resize vector with fill
• u32 from u8 buffer
• Windows

TypeScript

• Assertion functions

Unix

• Count matches in file
• file utility
• Find process running on port
• Finding size of folder
• Force quit hung ssh
• Killing other ssh connections
• List directories only
• mv Tips and Tricks
• Oh My Zsh Aliases
• Quickly paste clipboard to file
• Return just matched strings with grep
• shutdown aliases
• Sorting directories by size
• String manipulation
• tar with nested directories
• U2F
• Using variables in .env file on the command line
• which
• Yubico Authenticator on Fedora
• zmv

vim

• Changing next search hits
• Ruler

VS Code

• External terminal

WebAssembly

• Break statements
• Global variables
• Memory management
• Tables

About

I shamelessly stole this idea from
jbranchaud/til.

Other TIL Collections

• jwworth/til
• thoughtbot/til
• jbranchaud/til

License

This repository is licensed under the MIT license. See LICENSE for details.