Jeff Kreeftmeijer

/kreɪft·maɪ·ər/ Writes (about) software. Elixir & Ruby at AppSignal.

Joined on Apr 25, 2018 https://jeffkreeftmeijer.com

Jeff Kreeftmeijer

Aug 16 '21

Emacs package management with straight.el and use-package

#emacs

7 1

5 min read

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Jeff Kreeftmeijer

Aug 10 '21

Combine Git repositories with unrelated histories

#git

2 min read

Jeff Kreeftmeijer

Jun 29 '21

Testing input and output in Rust command line applications

#rust #programming #testing #tdd

4 min read

Jeff Kreeftmeijer

Jan 8 '21

Embrace email, mute Slack. A policy for handling incoming messages

#productivity

3 min read

Jeff Kreeftmeijer for AppSignal

Aug 13 '19

Multiplayer Go with Elixir's Registry, PubSub and dynamic supervisors

#elixir #phoenix #beginners

10 min read

Jeff Kreeftmeijer for AppSignal

Jul 4 '19

Building the Go Game in Elixir: Time Travel and the Ko Rule

#elixir #phoenix #beginners

54 1

9 min read

Jeff Kreeftmeijer for AppSignal

Jun 18 '19

Building and Playing the Go Game with Phoenix LiveView

#elixir #phoenix #beginners

7 min read

Jeff Kreeftmeijer for AppSignal

May 28 '19

Inside Enumeration in Ruby

#ruby #beginners #programming

6 min read

Jeff Kreeftmeijer for AppSignal

Mar 19 '19

Iteration, recursion, and tail-call optimization in Elixir

#elixir #beginners #programming

52 1

7 min read

Jeff Kreeftmeijer for AppSignal

Feb 5 '19

Unraveling Classes, Instances and Metaclasses in Ruby

#ruby #programming #beginners

45 2

5 min read

Jeff Kreeftmeijer for AppSignal

Jan 22 '19

Serving Plug: Building an Elixir HTTP server from scratch

#elixir #programming

9 min read

Jeff Kreeftmeijer for AppSignal

Jan 8 '19

Bindings and Lexical Scope in Ruby

#ruby #programming #beginners

5 min read

Jeff Kreeftmeijer

Dec 20 '18

What's your favorite Vim trick?

#discuss #vim #editor #terminal

41 32

1 min read

Jeff Kreeftmeijer for AppSignal

Dec 18 '18

Running Rack: How Ruby HTTP servers run Rails apps

#ruby #rails #programming #coding

9 min read

Jeff Kreeftmeijer for AppSignal

Dec 11 '18

Building a 30 line HTTP server in Ruby

#ruby #programming #coding #beginners

88 4

8 min read

Jeff Kreeftmeijer

Nov 29 '18

Consistent terminal colors with 16-ANSI-color Vim themes

#vim #editor #terminal

5 min read

Jeff Kreeftmeijer for AppSignal

Oct 16 '18

Hot Code Reloading in Elixir

#elixir #erlang #programming #beginners

49 7

8 min read

Jeff Kreeftmeijer for AppSignal

Sep 18 '18

How OTP Applications are structured

#elixir #beginners #programming #erlang

73 1

4 min read

Jeff Kreeftmeijer for AppSignal

Sep 4 '18

Closures in Ruby: Blocks, Procs and Lambdas

#ruby #programming #beginners #coding

75 3

6 min read

Jeff Kreeftmeijer for AppSignal

Jul 17 '18

JavaScript-sprinkled Rails Applications

#ruby #rails #javascript

46 1

5 min read

Jeff Kreeftmeijer for AppSignal

Jul 10 '18

Under the Hood: “Slurping” and Streaming Files in Ruby

#ruby #learning #beginners #programming

35 2

9 min read

Jeff Kreeftmeijer for AppSignal

Jun 19 '18

Caching counters with ActiveRecord's counter caches

#ruby #rails #optimization #caching

6 min read

Jeff Kreeftmeijer for AppSignal

Jun 12 '18

Deconstructing Elixir's GenServers

#elixir #learning #genserver

7 min read

Jeff Kreeftmeijer

Jun 5 '18

What's your favorite editor/terminal color scheme?

#discuss #editor #terminal

43 53

1 min read

Jeff Kreeftmeijer

Jun 4 '18

Find, convert and replace dates with Vim substitutions

#vim #editor #regex #productivity

17 3

6 min read

Jeff Kreeftmeijer for AppSignal

May 29 '18

Ruby's magical Enumerable module

#ruby #learning #enumerable

33 2

6 min read

Jeff Kreeftmeijer for AppSignal

May 23 '18

Speeding up your app’s navigation with Turbolinks

#beginners #rails #optimization #javascript

33 2

3 min read

Jeff Kreeftmeijer for AppSignal

May 16 '18

Ensuring execution, retrying failures and reraising exceptions in Ruby

#ruby #exceptions #beginners #learning

5 min read

Jeff Kreeftmeijer for AppSignal

May 2 '18

Client-side caching in Rails: conditional GET requests

#beginners #rails #optimization #caching

4 min read

Jeff Kreeftmeijer for AppSignal

Apr 25 '18

ActiveRecord performance: the N+1 queries antipattern

#beginners #rails #performance #ruby

69 3

6 min read

Jeff Kreeftmeijer for AppSignal

Apr 18 '18

Rails' built-in cache stores: an overview

#beginners #rails #caching #optimization

4 min read

Jeff Kreeftmeijer for AppSignal

Apr 11 '18

Rescuing exceptions in Ruby

#ruby #exceptions #beginners #learning

3 min read

Jeff Kreeftmeijer for AppSignal

Apr 4 '18

Russian doll caching in Rails

#performance #caching #optimization #rails

5 min read

Jeff Kreeftmeijer for AppSignal

Mar 29 '18

Understanding system load and load averages

#linux #devops #terminal #optimization

71 2

4 min read

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