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. These are things that don't really warrant a full blog post. These are things I've picked up by Learning In Public™ and pairing with smart people at Hashrocket.

For a steady stream of TILs, sign up for my newsletter.

1129 TILs and counting...

Ack

ack --bar
Case-Insensitive Search
List Available File Types

Amplify

Sign Up User With Email And Password

Chrome

Access A Value Logged To The Console
Chrome Supports Many Unix Keyboard Shortcuts
Copy Some Data From The Console
Duplicate The Current Tab
Easier Access To Network Throttling Controls
Pretty Print Tabular Data
Reference The Selected Node
Selecting DOM Elements Faster Than Ever
Simulating Various Connection Speeds
Toggle Device Mode
Toggle Open The Console Drawer
View Network Traffic For New Tabs

Clojure

Aggregation Using merge-with
Argument Requirements For A Function
Combinations Of Items From A Sequence
Define Something Only Once
Evaluate One Liners With lein-exec
Expanding Macros
Get The Value Of An Environment Variable
List Functions For A Namespace
Load A File Into The REPL
Mapping With An Index
Open JavaDocs
Pretty Print The Last Thing
Quick Clojure Docs
Reductions
Set Max Heap Size
Specify the Directory of a Shell Command
Splitting On Whitespace
Swap Two Items in a Vector
Try A Clojure Project In The REPL
Type of Anything
When Overflow Is Desired

CSS

Add Fab Icons To Your Site With FontAwesome 5
Animate Smoothly Between Two Background Colors
Apply Multiple Box Shadows To Single Element
Apply Styles Based On Dark-Mode Preferences
Apply Styles To The Last Child Of A Specific Type
Change The Orientation Of An Image
Circular Icons With A Massive Border Radius
Clean Up Repetition With :is() Pseudo-Class
Conditional Styling For Unsupported CSS Features
Create A Pulsing Background With CSS Animation
Define CSS Custom Properties With CSS Variables
Define HSL Colors With Alpha Values
Display Responsive iframe Maintaining Aspect Ratio
Dry Up SCSS With Mixins
Give Elements The Same Width With Flexbox
Let Pointer Events Pass Through An Element
Lighten And Darken With CSS Brightness Filter
Lighten And Darken With SCSS
Make A Block Of Text Respect New Lines
Parameterized SCSS Mixins
:root Has Higher Specificity Than html
Style A Background With A Linear Gradient
Using Maps In SCSS

Devops

Aliasing An Ansible Host
Allow Cross-Origin Requests To Include Cookies
Allow HTTPS Through Your UFW Firewall
Check The Status of All Services
Check The Syntax Of nginx Files
Connect To An RDS PostgreSQL Database
Determine The IP Address Of A Domain
Path Of The Packets
Push Non-master Branch To Heroku
Reload The nginx Configuration
Resolve The Public IP Of A URL
Running Out Of inode Space
SSH Into A Docker Container
SSL Certificates Can Cover Multiple Domains
Wipe A Heroku Postgres Database

Elixir

All Values For A Key In A Keyword List
Append To A Keyword List
Assert An Exception Is Raised
Binary Representation Of A String
Check For A Substring Match
Check List Membership
Comparing DateTime Structs
Compute Intermediate Values In A With Construct
Compute md5 Digest Of A String
Counting Records With Ecto
Create A Date With The Date Sigil
Create A List Of Atoms
Creating A PID
Creating Indexes With Ecto
Defining Multiple Clauses In An Anonymous Function
Determine The Latest Release Of A Hex Package
Do You Have The Time?
Do You Have The Time? - Part 2
Documentation Lookup With Vim And Alchemist
Dynamically Generating Atoms
Execute Raw SQL In An Ecto Migration
Expose Internal Representation
Include Captures With String.split
Inspecting The Process Message Queue
List Functions For A Module
Listing Files In IEx
Match On A Map In A With Construct
Passing Around And Using Modules
Pattern Matching In Anonymous Functions
Pipe Into A Case Statement
Quitting IEx
Range Into List Using Comprehensions
Refer To A Module Within Itself
Referencing Values In IEx's History
Remove One List From Another
Replace Duplicates In A Keyword List
Requiring Keys For Structs
Reversing A List
Reversing A List - Part 2
Root Directory Of A Project
Round Floats To Integers
Run ExUnit Tests In A Deterministic Order
Run The Test At A Specific Line Number
Same Functions Should Be Grouped Together
Skip A Specific Test
String Interpolation With Just About Anything
Unique Indexes With Ecto
Updating Values In A Map
Using When Clauses In A With Construct
Virtual Fields With Ecto Schemas
When Things Don't Match The With Statements
Word Lists For Atoms

Gatsby

Add JavaScript To Body Of The Document

Git

Accessing a Lost Commit
Amend Author Of Previous Commit
Auto-Squash Those Fixup Commits
Caching Credentials
Change The Start Point Of A Branch
Checking Commit Ancestry
Checkout Old Version Of A File
Checkout Previous Branch
Cherry Pick A Range Of Commits
Clean Out All Local Branches
Clean Up Old Remote Tracking References
Clone A Repo Just For The Files, Without History
Clone A Repo Locally From .git
Configure Global gitignore File
Configuring The Pager
Copy A File From Another Branch
Create A New Branch With Git Switch
Delete All Untracked Files
Determine The Hash Id For A Blob
Diffing With Patience
Dropping Commits With Git Rebase
Dry Runs in Git
Exclude A File From A Diff Output
Excluding Files Locally
Find The Date That A File Was Added To The Repo
Find The Initial Commit
Get The Name Of The Current Branch
Get The Short Version Of The Latest Commit
Grab A Single File From A Stash
Grep For A Pattern On Another Branch
Grep Over Commit Messages
Ignore Changes To A Tracked File
Ignore Files Specific To Your Workflow
Include A Message With Your Stashed Changes
Include Or Exclude Remaining Patch Changes
Include Some Stats In Your Git Log
Intent To Add
Interactively Unstage Changes
Last Commit A File Appeared In
List All Files Changed Between Two Branches
List Branches That Contain A Commit
List Commits On A Branch
List Different Commits Between Two Branches
List Filenames Without The Diffs
List Just The Files Involved In A Commit
List Most Git Commands
List Untracked Files
List Untracked Files For Scripting
Move The Latest Commit To A New Branch
Pick Specific Changes To Stash
Pulling In Changes During An Interactive Rebase
Push To A Branch On Another Remote
Quicker Commit Fixes With The Fixup Flag
Rebase Commits With An Arbitrary Command
Reference A Commit Via Commit Message Pattern Matching
Rename A Remote
Renaming A Branch
Resetting A Reset
Resolve A Merge Conflict From Stash Pop
Run A Git Command From Outside The Repo
Set A Custom Pager For A Specific Command
Show All Commits For A File Beyond Renaming
Show Changes For Files That Match A Pattern
Show Changes In The Compose Commit Message View
Show File Diffs When Viewing Git Log
Show List Of Most Recently Committed Branches
Show Only Commits That Touch Specific Lines
Show The diffstat Summary Of A Commit
Show The Good And The Bad With Git Bisect
Show What Is In A Stash
Single Key Presses in Interactive Mode
Skip A Bad Commit When Bisecting
Skip Pre-Commit Hooks
Staging Changes Within Vim
Staging Stashes Interactively
Stash A Single Untracked File
Stash Everything
Stashing Only Unstaged Changes
Stashing Untracked Files
Switch To A Recent Branch With FZF
Turn Off The Output Pager For One Command
Two Kinds Of Dotted Range Notation
Unstage Changes Wih Git Restore
Untrack A Directory Of Files Without Deleting
Untrack A File Without Deleting It
Update The URL Of A Remote
Using Commands With A Relative Date Format
Verbose Commit Message
Viewing A File On Another Branch
What Changed?
What Is The Current Branch?
Whitespace Warnings

GitHub Actions

Capture An Output Value For Use In A Later Step
Reference An Encrypted Secret In An Action

Go

Access Go Docs Offline
Build For A Specific OS And Architecture
Not So Random
Replace The Current Process With An External Command
Sleep For A Duration
Upgrading From An Older Version On Mac

Heroku

Deploy A Review App To A Different Stack
Set And Show Heroku Env Variables

HTML

Adding Alt Text To An Image
Disable Auto-Completion For A Form Input
Prevent Search Engines From Indexing A Page
Render Text As Superscript
Submit A Form With A Button Outside The Form

HTTP

What Counts As Cross-Origin With CORS?

Internet

Add Emoji To GitHub Repository Description
Enable Keyboard Shortcuts In Gmail
Exclude Whitespace Changes From GitHub Diffs
Figure Out Your Public IP Address
Focus The URL Bar
Get Random Images From Unsplash
Search Tweets By Author
Show All Pivotal Stories With Blockers

JavaScript

Accessing Arguments To A Function
Basic Date Formatting Without A Library
Character Codes from Keyboard Listeners
Check Classes On A DOM Element
Check If Something Is An Array
Check The Password Confirmation With Yup
Compare The Equality Of Two Date Objects
Computed Property Names In ES6
Conditionally Include Pairs In An Object
Configure Jest To Run A Test Setup File
Create A Cancelable Promise With PCancelable
Create An Array Containing 1 To N
Create An Object With No Properties
Create Bootstrapped Apps With Yarn
Create Future And Past Dates From Today
Custom Type Checking Error Messages With Yup
Default And Named Exports From The Same Module
Define A Custom Jest Matcher
Destructure With Access To Nested Value And Parent Value;
Destructuring The Rest Of An Array
Enable ES7 Transforms With react-rails
Ensure Shell Can Find Global npm Binaries
Easy Date Comparison With DayJS
Expand Emojis With The Spread Operator
Fill An Input With A Ton Of Text
Find Where Yarn Is Installing Binaries
for...in Iterates Over Object Properties
Formatting Values With Units For Display
Freeze An Object, Sorta
Generate Random Integers
Get The Location And Size Of An Element
Get The Response Status From An Axios Error
Get The Time Zone Of The Client Computer
Globally Install A Package With Yarn
Immutable Remove With The Spread Operator
Initialize A New JavaScript Project With Yarn
Install The Latest Version Of Node With Nvm
Interpolate A String Into A Regex
ISO-8601 Formatted Dates Are Interpreted As UTC
Link A JavaScript Package Locally
List Top-Level NPM Dependencies
Make The Browser Editable With Design Mode
Matching A Computed Property In Function Args
Matching Multiple Values In A Switch Statement
Mock A Function With Return Values Using Jest
New Dates Can Take Out Of Bounds Values
Numbers Are Empty
Object Initialization With Shorthand Property Names
Obtain Undefined Value With The Void Operator
Parse A Date From A Timestamp
Random Cannot Be Seeded
Reach Into An Object For Nested Data With Get
Render An Array Of Elements With React 16
Resolve And Pass Multiple Values From A Then
Running ES6 Specs With Mocha
Scoping Variables With A Block Statement
Sorting Arrays Of Objects With Lodash
Splat Arguments To A Function
Spread The Rest With ES6
Start Node Process In Specific Timezone
String Interpolation With Template Literals
Support Nested Matching In Custom Jest Matchers
Tell Prettier To Not Format A Statement
Test Coverage Stats With Jest
Test Timing-Based Code With Jest Fake Timers
The Comma Operator
Throttling A Function Call
Timing Processes
Transforming ES6 and JSX With Babel 6
Truthiness of Integer Arrays
Turn An HTMLCollection Into An Array
Turn Off Console Error Messages In A Test
Waiting On Multiple Promises
Who Am I: NPM Edition
Yarn Commands Without The Emojis
Yup Schemas Are Validated Asynchronously

jq

Extract A List Of Values

Kitty

Set The Title Of A Window
Use The Built-In Emoji Picker

Linux

Check Ubuntu Version
Configure Your Server Timezone
List The Statuses Of All Upstart Jobs
Show Current System Time And Settings
Upgrading Ubuntu

Mac

Access All Screen And Video Capture Options
Access System Information On OS X
Access Unsupported Screen Resolutions With RDM
Clean Up Old Homebrew Files
Convert An HEIC Image File To JPG
Default Screenshot Location
Disable Swipe Navigation For A Specific App
Display A Message With Alfred
Find The Process Using A Specific Port
Gesture For Viewing All Windows Of Current App
Insert A Non-Breaking Space Character
List All The Say Voices
Quickly Type En Dashes And Em Dashes
Require Additional JS Libraries In Postman
Resize App Windows With AppleScript
Resizing Both Corners Of A Window
Run A Hardware Check
Run AppleScript Commands Inline In The Terminal
Set A Window To Its Default Zoom Level
Specify App When Opening From Command Line
Use Default Screenshot Shortcuts With CleanShot X
View All Windows Of The Current App

MongoDB

Determine The Database Version
Dump A Remote Database
Get Size Stats For A Collection
List Size Stats For All Collections

MySQL

Display Output In A Vertical Format
Doing Date Math
Dump A Database To A File
List Databases And Tables
Show Create Statement For A Table
Show Tables That Match A Pattern
Show Indexes For A Table

Netlify

Override The Default Yarn Version

Next.js

Create Files And Directories For Dynamic Routes
Define URL Redirects In The Next Config
Remove A Query Param From The URL
Ship Public Assets With A Next.js App

Phoenix

Bypass Template Rendering
Check The Installed Version
Generate New App Without Brunch
Render A Template To A String
Serve Static Assets From Custom Directory
Specifying The Digest Directory
Specifying The Server Port

PostgreSQL

A Better Null Display Character
Add Foreign Key Constraint Without A Full Lock
Add ON DELETE CASCADE To Foreign Key Constraint
Adding Composite Uniqueness Constraints
Aggregate A Column Into An Array
Assumed Radius Of The Earth
Auto Expanded Display
Between Symmetric
Capitalize All The Words
Change The Current Directory For psql
Check If The Local Server Is Running
Check Table For Any Oprhaned Records
Checking Inequality
Checking The Type Of A Value
Clear The Screen In psql
Clear The Screen In psql (2)
Compute Hashes With pgcrypto
Compute The Levenshtein Distance Of Two Strings
Compute The md5 Hash Of A String
Configure The Timezone
Constructing A Range Of Dates
Convert A String To A Timestamp
Count How Many Records There Are Of Each Type
Count Records By Type
Count The Number Of Trues In An Aggregate Query
Create A Composite Primary Key
Create An Index Without Locking The Table
Create Database Uses Template1
Create hstore From Two Arrays
Create Table Adds A Data Type
Creating Conditional Constraints
Creating Custom Types
Day Of Week By Name For A Date
Day Of Week For A Date
Default Schema
Defining Arrays
Determine Types Of JSONB Records
Determining The Age Of Things
Difference Between Explain And Explain Analyze
Dump All Databases To A SQL File
Dump And Restore A Database
Duplicate A Local Database
Edit Existing Functions
Escaping A Quote In A String
Escaping String Literals With Dollar Quoting
Export Query Results To A CSV
Extracting Nested JSON Data
Find Duplicate Records In Table Without Unique Id
Find Records That Contain Duplicate Values
Find Records That Have Multiple Associated Records
Find The Data Directory
Find The Location Of Postgres Config Files
Fizzbuzz With Common Table Expressions
Force SSL When Making A psql Connection
Generate A UUID
Generate Random UUIDs Without An Extension
Generate Series Of Numbers
Generating UUIDs With pgcrypto
Get The Size Of A Database
Get The Size Of A Table
Get The Size Of An Index
Getting A Slice Of An Array
Group By The Result Of A Function Call
Insert A Bunch Of Records With Generate Series
Insert Just The Defaults
Install Postgres With uuid-ossp Using asdf
Integers In Postgres
Intervals Of Time By Week
Is It Null Or Not Null?
Limit Execution Time Of Statements
List All Columns Of A Specific Type
List All Rows In A Table
List All The Databases
List All Versions Of A Function
List Available Schemas
List Connections To A Database
List Database Objects With Disk Usage
List Database Users
List Various Kinds Of Objects
Lower Is Faster Than ilike
Max Identifier Length Is 63 Bytes
pg Prefix Is Reserved For System Schemas
Prepare, Execute, And Deallocate Statements
Pretty Print Data Sizes
Pretty Printing JSONB Rows
Prevent A Query From Running Too Long
Print The Query Buffer In psql
Remove Not Null Constraint From A Column
Renaming A Sequence
Renaming A Table
Restart A Sequence
Restarting Sequences When Truncating Tables
Salt And Hash A Password With pgcrypto
Send A Command To psql
Set Inclusion With hstore
Set A Seed For The Random Number Generator
Set A Statement Timeout Threshold For A Session
Sets With The Values Command
Shorthand Absolute Value Operator
Show All Versions Of An Operator
Sleeping
Special Math Operators
Storing Emails With citext
String Contains Another String
Switch Non-Castable Column Type With Using Clause
Switch The Running Postgres Server Version
Temporarily Disable Triggers
Temporary Tables
Terminating A Connection
Timestamp Functions
Toggling The Pager In PSQL
Track psql History Separately Per Database
Truncate All Rows
Truncate Tables With Dependents
Turning Timing On
Two Ways To Compute Factorial
Types By Category
Use A psqlrc File For Common Settings
Use Argument Indexes
Use Not Valid To Immediately Enforce A Constraint
Using Expressions In Indexes
Using Intervals To Offset Time
Who Is The Current User
Word Count for a Column
Write A Query Result To File

Python

Access Instance Variables
Create A Dummy DataFrame In Pandas
Test A Function With Pytest

Rails

Add A Check Constraint To A Table
Add A Foreign Key Reference To A Table
Add A Reference Column With An Index
Add React With Webpacker To A New Rails App
Add timestamptz Columns With The Migration DSL
Access Secrets In A Rails 5.2 App
ActiveRecord Query For This Or That
Advance The Date
Allow List Params Anywhere With Strong Params
All or Nothing Database Transactions
Assert Two Arrays Have The Same Items With RSpec
Attach A File With Capybara
Attribute Getter without the Recursion
Attribute Was
Autosave False On ActiveRecord Associations
Bind Parameters To ActiveRecord SQL Query
Build A Hash Of Model Attributes
Capture Development Emails With Mailhog
Capybara Page Status Code
Cast Common Boolean-Like Values To Booleans
Change The Nullability Of A Column
Change The Time Zone Offset Of A DateTime Object
Check If ActiveRecord Update Fails
Check If Any Records Have A Null Value
Check Specific Attributes On ActiveRecord Array
Code Statistics For An Application
Columns With Default Values Are Nil On Create
Comparing DateTimes Down To Second Precision
Conditional Class Selectors in Haml
Convert A Symbol To A Constant
Count The Number Of Records By Attribute
Create A Custom Named References Column
Create A Join Table With The Migration DSL
Creating Records of Has_One Associations
Custom Validation Message
Customize Paths And Helpers For Devise Routes
Customize The Path Of A Resource Route
Delete Paranoid Records
Demodulize A Class Name
Different Ways To Add A Foreign Key Reference
Disambiguate Where In A Joined Relation
Ensure Migrations Use The Latest Schema
Force All Users To Sign Out
Generating And Executing SQL
Get An Array Of Values From The Database
Get An Empty ActiveRecord Relation
Get The Column Names For A Model
Get The Current Time
Hash Slicing
Ignore Poltergeist JavaScript Errors
Include Devise Helpers In Your Controller Tests
Inspect Previous Changes To ActiveRecord Object
Link To The Current Page With Query Params
List All Installable Rails Versions
List The Enqueued Jobs
Load Records In Batches With find_each
Log SQL Queries Executed By ActiveRecord
Mark A Migration As Irreversible
Make ActionMailer Synchronous In Test
Manually Run A Migration From Rails Console
Mark For Destruction
Mask An ActiveRecord Attribute
Merge A Scope Into An ActiveRecord Query
Migrating Up Down Up
Order Matters For rescue_from Blocks
Params Includes Submission Button Info
Parse Query Params From A URL
Perform SQL Explain With ActiveRecord
Polymorphic Path Helpers
Pretend Generations
Query A Single Value From The Database
Read In Environment-Specific Config Values
Read-Only Models
Remove The Default Value On A Column
Render An Alternative ActionMailer Template
Render The Response Body In Controller Specs
Replace An Index With A Unique Index
Rescue From
Retrieve An Object If It Exists
Rollback A Specific Migration Out Of Order
Rounding Numbers With Precision
Schedule Sidekiq Jobs Out Into The Future
Secure Passwords With Rails And Bcrypt
Select A Select By Selector
Select Value For SQL Counts
Serialize With fast_jsonapi In A Rails App
Set A Timestamp Field To The Current Time
Set default_url_options For Entire Application
Set Schema Search Path
Set Statement Timeout For All Postgres Connections
Set The Default Development Port
Show Pending Migrations
Show Rails Models With Pry
Show Rails Routes With Pry
Skip Validations When Creating A Record
Specify New Attributes For #find_or_create_by
Temporarily Disable strong_params
Test If An Instance Variable Was Assigned
Truncate Almost All Tables
Update Column Versus Update Attribute
Upgrading Your Manifest For Sprocket's 4
Verify And Read A Signed Cookie Value
Where Am I In The Partial Iteration?
Wipe Out All Precompiled Assets
Write Reversible Migration To Set Default
Write Safer Where Clauses With Placeholders

React

A Component Is Just A Bag Of Data
Access The Latest Lifecycle Methods In An Old App
Accessing Env Vars In create-react-app
Accessing Location Within @reach/router
Allow md As An Extension With gatsby-mdx
Alter The Display Name Of A Component
Building A React App In The Browser
Check The Type Of A Child Component
Conditionally Including Event Handler Functions
Create A Snowpack-Bundled React App
Create Dynamically Named Custom React Components
create-react-app Comes With Lodash
create-react-app Has A Default Test Setup File
CSS !important Is Not Supported By Inline Styles
Debug Jest Tests In create-react-app
Defining State In A Simple Class Component
Destructure Variables As Props To A Component
Details Tags Are A Controllable Component
Dispatch Anywhere With Redux
Dynamically Add Props To A Child Component
Dynamically Create HTML Elements
Enforce Specific Values With PropTypes
Focus An Input With useRef Hook
Force A Component To Only Have One Child
Forcing A Child Remount With The Key Prop
Formik Connected Components
Formik's Validation Schema As A Function
Inactive And Active Component Styles With Radium
Inline Style Attributes Should Be Camel Cased
Manage State In A Functional Component
Mapping Over One Or Many Children
Mock A Function That A Component Imports
Navigate With State Via @reach/router
Pairing A Callback With A useState Hook
Pass A Function To A useState Updater
Passing Props Down To React-Router Route
Prevent reach/router Redirect Error Screen In Dev
Proxy To An API Server In Development With CRA
Quickly Search For A Component With React DevTools
@reach/router Renders To A Div
Read Only Input Elements
Rendering Multiple Nodes With Fragments
Set The Type For A useState Hook
Specifying Dependencies Of A useEffect Hook
Spelunking Through Components With Enzyme's Dive
Sync Your react-router State With Redux
Test Files In create-react-app
Test That Element Does Not Render In The Component
Trigger Effect Only When The Component Mounts
Update Formik Initial Values When Props Change
Upgrading To The Latest React In CodeSandbox
Use A Ref To Autofocus An Input
Use React 16 With Gatsby
Use withRouter To Pass Down React-Router History
Visually Select A React Element For Inspection
Who Is Your Favorite Child?
Wrap The Root Of A Gatsby App In A Component

React Native

Avoid The Notch With SafeAreaView

React Testing Library

Check That A Component Renders As Null
findBy* Queries Have Async Built In
Pretty Print Some DOM To Debug A Test
Test A Component That Uses React Portals

ReasonML

Break Out Of A While Loop
Compile Reason To Native With Dune
Compile Reason With An OCaml Package Using Dune
Create A Map Of Strings
Create A Stream From An Array
Creating A 2D Array
Data Structures With Self-Referential Types
Defining Variants With Constructor Arguments
Dynamically Create A Printf String Format
Exhaustive Pattern Matching Of List Variants
Format The Current File Within Vim
Generate A Native ReasonML Project With Pesy
Generate Starter Reason Projects
Helping The Compiler Help Us With Variants
Inline Component Styles With Reason React
Is This A Directory Or A File?
Making Things Mutable
Modifying A String With blit_string
Multi-Argument Functions As Syntactic Sugar
Pattern Match On Exceptions
Quickly Bootstrap A React App Using Reason
Seeding And Generating Random Integers
Stream A File Line By Line
String Interpolation With Integers And Sprintf
String Interpolation With Quoted Strings
Trying Out ReasonML In CodeSandbox
Two Ways To Find An Item In A List
Using Optional Labeled Function Arguments
Wrapping A Component For Use In JavaScript

Ruby

A Shorthand For Rerunning Failed Tests With RSpec
Add Linux As A Bundler Platform
Are They All True?
Assert About An Object's Attributes With RSpec
Assoc For Hashes
Block Comments
Chaining Multiple RSpec Change Matchers
Check Return Status Of Running A Shell Command
Click On Text With Capybara
Colorful Output With MiniTest
Comparing Class Hierarchy Relationships
Comparing Arrays In RSpec
Construct A Constant From A String
Create an Array of Stringed Numbers
Create a CSV::Table Object
Create A Hash From An Array Of Arrays
Create Listing Of All Middleman Pages
Create Named Structs With Struct.new
Create Thumbnail Image For A PDF
Defaulting To Frozen String Literals
Define A Custom RSpec Matcher
Destructuring Arrays In Blocks
Disassemble Some Codes
Double Splat To Merge Hashes
Edit Previous Parts Of The Pry Buffer History
Editing Code In Pry
Encode A String As URL-Safe Base64
Enumerate A Pairing Of Every Two Sequential Items
Evaluating One-Off Commands
Exclude Values From An Array
Expect A Method To Be Called And Actually Call It
FactoryGirl Sequences
Fail
Find The Min And Max With A Single Call
Finding The Source of Ruby Methods
Generate A Signed JWT Token
Generate Ruby Version And Gemset Files With RVM
Get Info About Your RubyGems Environment
Identify Outdated Gems
If You Detect None
Iterate With An Offset Index
Ins And Outs Of Pry
Invoking Rake Tasks Multiple Times
IRB Has Built-In Benchmarking With Ruby 3
Jump Out Of A Nested Context With Throw/Catch
Last Raised Exception In The Call Stack
Limit Split
List The Running Ruby Version
Listing Local Variables
Map With Index Over An Array
Mock Method Chain Calls With RSpec
Mocking Requests With Partial URIs Using Regex
Named Regex Captures Are Assigned To Variables
Navigate Back In The Browser With Capybara
Next And Previous Floats
Or Operator Precedence
Override The Initial Sequence Value
Parallel Bundle Install
Parsing A CSV With Quotes In The Data
Pass A Block To Count
Passing Arbitrary Methods As Blocks
Passing Arguments To A Rake Task
Pattern Match Values From A Hash
Percent Notation
Question Mark Operator
Rake Only Lists Tasks With Descriptions
Read The First Line From A File
Rendering ERB
Replace The Current Process With An External Command
Require Entire Gemfile In Pry Session
Rerun Only Failures With RSpec
Retry A Block After An Exception
Returning With Sequel
rexml Is A Bundled Gem As Of Ruby 3.0.0
Run An Older Version Of Bundler
Running A Single MiniTest Example
Safe Navigation Operator
Scripting With RVM
Scroll To Top Of Page With Capybara
Set RVM Default Ruby
Show Public Methods With Pry
Silence The Output Of A Ruby Statement In Pry
Single And Double Quoted String Notation
Squeeze Out The Extra Space
String Interpolation With Instance Variables
Summing Collections
Turn Key And Value Arrays Into A Hash
Turning Any Class Into An Enumerator
Turning Things Into Hashes
Uncaught Exceptions In Pry
undef_method And The Inheritance Hierarchy
Uninstall Specific Version Of A Ruby Gem
Unpacking Strings Into Binary
Up And Down With Integers
Update The Gemfile Bundled With Version
Use A Case Statement As A Cond Statement
Use dotenv In A Non-Rails Project
Use Tap For Better Test Data Setup
Using BCrypt To Create And Check Hashed Passwords
What To Do When You Don't Rescue
Who Are My Ancestors?
Wrap Things In An Array, Even Hashes
Zero Padding

sed

Apply Multiple Substitutions To The Input
Equivalence Classes Of Repetition MetaChars
Extract Value From Command Output With Sed
Grab All The Method Names Defined In A Ruby File
Grab The First Line Of A File
OSX sed Does Regex A Bit Different
Output Only Lines Involved In A Substitution
Reference A Capture In The Regex
Use An Alternative Delimiter In A Substitution

Shell

Check If The First Argument Is Given
Format And Print The Current Date And Time

Streaming

Monitor An Audio Input Device In OBS

Tailwind CSS

Base Styles For Text Link
Specify Paths For Purging Unused CSS
Use Tailwind Typography Prose In Dark Mode

tmux

Access Past Copy Buffer History
Adjusting Window Pane Size
Break Current Pane Out To Separate Window
Change Base Directory Of Existing Session
Change The Default Prefix Key
Create A Named tmux Session
Create A New Session In A New Server
Cycle Through Layouts
Enabling Vi Mode
Get Mouse Copy/Paste Working In Kitty
Hiding The Status Bar
Jumping Between Sessions
Kill All Your tmux Sessions
Kill Other Connections To A Session
Kill The Current Session
List All Key Bindings
List Sessions
Open New Window With A Specific Directory
Organizing Windows
Paging Up And Down
Pane Killer
Reclaiming The Entire Window
Remove The Delay On The Escape Key
Rename The Current Session
Reset An Option Back To Its Default Value
Show The Current Value For An Option
Swap Split Panes
Switch To A Specific Session And Window
tmux in your tmux
Toggle Between Two Common Sessions

TypeScript

Add Types To An Object Destructuring
Compiler Checks For Unused Params And Variables
Re-Export An Imported Type
Type Narrowing With Similarly Shaped Objects
Use An Array Check For Type Narrowing
Zero-Config Environments For Trying Out Types

Unix

All The Environment Variables
Cat A File With Line Numbers
Cat Files With Color Using Bat
Change Default Shell For A User
Change To That New Directory
Check If A Port Is In Use
Check If Command Is Executable Before Using
Check The Current Working Directory
Clear The Screen
Command Line Length Limitations
Compare Two Variables In A Bash Script
Configure cd To Behave Like pushd In Zsh
Copying File Contents To System Paste Buffer
Copying Nested Directories With Ditto
Count The Number Of Matches In A Grep
Create A File Descriptor with Process Substitution
Curl With Cookies
Curling For Headers
Curling With Basic Auth Credentials
Display All The Terminal Colors
Display Free Disk Space
Display The Contents Of A Directory As A Tree
Do A Dry Run Of An rsync
Do Not Overwrite Existing Files
Enable Multi-Select Of Results With fzf
Exclude A Directory With Find
Exclude Certain Files From An rsync Run
Figure Out The Week Of The Year From The Terminal
File Type Info With File
Find A File Installed By Brew
Find Files With fd
Find Newer Files
Fix Unlinked Node Binaries With asdf
Forward Multiple Ports Over SSH
Generate A SAML Key And Certificate Pair
Get Matching Filenames As Output From Grep
Get The Unix Timestamp
Global Substitution On The Previous Command
Globbing For All Directories In Zsh
Globbing For Filenames In Zsh
Grep For Files Without A Match
Grep For Files With Multiple Matches
Grep For Multiple Patterns
Hexdump A Compiled File
Ignore The Alias When Running A Command
Interactively Browse Available Node Versions
Jump To The Ends Of Your Shell History
Kill Everything Running On A Certain Port
Killing A Frozen SSH Session
Last Argument Of The Last Command
Less With Style
List All Users
List Files Ordered By Modification Date
List Names Of Files With Matches
List Of Sessions To A Machine
List Parent pid With ps
List Stats For A File
List The Available JDKs
List The Stack Of Remembered Directories
Map A Domain To localhost
Only Show The Matches
Open The Current Command In An Editor
Partial String Matching In Bash Scripts
PID Of The Current Shell
Print A Range Of Lines For A File With Bat
Print Out Files In Reverse
Provide A Fallback Value For Unset Parameter
Repeat Yourself
Saying Yes
Search Files Specific To A Language
Search History
Search Man Page Descriptions
Securely Remove Files
Set The asdf Package Version For A Single Shell
Show A File Preview When Searching With FZF
Show Disk Usage For The Current Directory
Show The Size Of Everything In A Directory
Skip Paging If Output Fits On Screen With Less
SSH Escape Sequences
SSH With Port Forwarding
Specify The Language For A File With Bat
Sort In Numerical Order
Switch Versions of a Brew Formula
Touch Access And Modify Times Individually
Undo Some Command Line Editing
Update Package Versions Known By asdf Plugin
Use fzf To Change Directories
Use Regex Pattern Matching With Grep
View A Web Page In The Terminal
Watch The Difference
Watch This Run Repeatedly
Where Are The Binaries?

Vercel

Add Web Server Layer Redirects
Deploy An App Without Pushing An Empty Commit
Naming Of The Vercel Config File
Share Development Environment Variables Via CLI

Vim

Aborting Git Commits And Rebases
Absolute And Relative Line Numbers
Add A File Without Loading It
Add Custom Dictionary Words
All The Ways To Write And Quit In Vim
Allow Neovim To Copy/Paste With System Clipboard
Almost The End Of The Line
Alternate Files With vim-rails
Always Keep The Gutter Open
Amend Commits With Fugitive
Backspace Options
Beginning And End Of Previous Change
The Black Hole Register
Blank Lines Above And Below
Breaking The Undo Sequence
Buffer Time Travel
Build And Install A Go Program
Case-Aware Substitution With vim-abolish
Case-Insensitive Substitution
Center The Cursor
Check For An Executable
Check Your Current Color Scheme
Clear Out The Jump List
Close All Other Splits
Close All Other Windows
Close the Current Buffer
Coerce The Current Filetype
Coercing Casing With vim-abolish
Configure FZF To Use fd For File Finding
Count the Number of Matches
Create A New Directory In netrw
Create A New File In A New Directory
Creating Non-Existent Directories
Default netrw To Tree Liststyle
Delete Every Other Line
Delete Lines That Match A Pattern
Delete To The End Of The Line
Deleting Buffers In BufExplorer
Deleting Directories Of Files From netrw
Detect If You Are On A Mac
Difference Between :wq and :x
Display Word Count Stats
Edges Of The Selection
Edit A File At A Specific Line Number
Edit A File Starting On The Last Line
End Of The Word
Escaping Terminal-Mode In An Nvim Terminal
Filter Lines Through An External Program
Fix The Spelling Of A Word
Fold A Visual Selection And Expand It Back
For When That Escape Key Is Hard To Reach
Format Long Lines To Text Width
From Ruby Variables To JavaScript Variables
Generate and Edit Rails Migration
Get The pid Of The Session
Go Back To The Previous Window
Go To File With Line Number
Grepping Through The Vim Help Files
Head of File Name
Help For Non-Normal Mode Features
Highlighting Search Matches
Horizontal to Vertical and Back Again
Increment All The Numbers
Incremental Searching
Interact With The Alternate File
Interactive Buffer List
Joining Lines Together
Jump Back To The Latest Jump Position
Jump Between And Stage Git Hunks With Fugitive
Jump To Matching Pair
Jump To The Next Misspelling
List All Buffers
List Of Plugins
Load A Directory Of Files Into The Buffer List
Make Directories For The Current File
Marks Across Vim Sessions
Match The Beginning And End Of Words
Moving To A Specific Line
Navigate To The Nth Column On A Line
Navigating By Blank Lines
NETRW Listing Styles
Next Modified Buffer
Normal Node Binding To Just Quit
Open A Tag In A Split Window
Open an Unnamed Buffer
Open FZF Result In A Split
Open Routes File With vim-rails
Open The Directory Of The Current File
Open The Fugitive Git Summary Window
Open The Gemfile
Open The Latest Rails Migration
Open The Selected Lines In GitHub With Gbrowse
Open Vim To A Tag Definition
Opening a URL
Opening Man Pages In Vim
Paste A Register From Insert Mode
Preventing Typos with Abbreviations
Previous Buffer
Previous Visual Selection
Print The Relative Path Of The Current File
Print Version Information
Quick File Info
Quick Man Pages
Quick Quickfix List Navigation
Quickly Fix A Misspelled Word
Quickly Switch To A Buffer By Number
Quit When There Is An Argument List
Re-indenting Your Code
Read In The Contents Of A Rails File
Rename A File Through netrw
Rename Current File
Repeat The Previous Change
Repeating Characters
Replace A Character
Reset Target tslime Pane
Reverse A Group Of Lines
Rotate Everything By 13 Letters
Rotate The Orientation Of Split Windows
Running Bundle With vim-bundler
Scrolling Relative to the Cursor
Search Backward Through A File
Searching For Hex Digits
Select Several Results From An FZF Search
Set End Of Line Markers
Set Your Color Scheme
Set Up Vim-Plug With Neovim
Setting Filetype With Modelines
Show All Syntax Highlighting Rules
Show Matching Entries For Help
Specify The Line Height Of The Quick Fix Window
Split Different
Split The Current Window
Splitting For New Files
Source Original vimrc When Using Neovim
Swap Occurrences Of Two Words
Swapping Split Windows
Tabs To Spaces
The Vim Info File
Toggle Absolute And Relative Paths In BufExplorer
Toggling Syntax Highlighting
Turning Off Search Highlighting
Unloading A Buffer
Use Active Window With BufExplorer
Use The Terminal Inside A Vim Session
Using vim-surround With A Visual Selection
Verbose Commits With Fugitive
View Commit History of a File
Viewing Man Pages with man.vim
Vim Without The Extras
What Is On The Runtime Path?
Whole Line Auto-Completion
Wrap With Some Room

VSCode

Add The VSCode CLI To Your Path
Advance Through Search Results
Enable Breadcrumbs For Version 1.26 Release
Open An Integrated Terminal Window
Toggle Between Terminals

Webpack

Better Module Imports With Aliases
Debugging With Full Source Maps
Run ESLint As A Preloader
Specify Port Of CRA's Webpack Dev Server
Use A Specific Config File

Workflow

Change Window Name In iTerm
Convert An ePub Document To PDF On Mac
Create A Public URL For A Local Server
Enable Dev Tools For Safari
Forward Stripe Events To Local Server
Get Your Public IP Address
Import A Github Project Into CodeSandbox
Interactively Kill A Process With fkill
Open Slack's Keyboard Shortcuts Reference Panel
Prune The Excess From node_modules
Rotate An Image To Be Oriented Upright
Set Recurring Reminders In Slack
Toggle Between Stories In Storybook
Update asdf Plugins With Latest Package Versions
View The PR For The Current GitHub Branch

XState

Use An XState Machine With React

YAML

Create Multi-Line Strings Without The Line Breaks

Usage

The .vimrc file for this project contains a function CountTILs that can be invoked with <leader>c. This will do a substitution count of the current number of TILs and display the result in the command tray.

About

I shamelessly stole this idea from thoughtbot/til.

Other TIL Collections

Today I Learned by Hashrocket
jwworth/til
thoughtbot/til

License

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

Files

README.md

Latest commit

History