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Jeff Kreeftmeijer profile picture

Jeff Kreeftmeijer

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

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

Reactions 63
10 min read

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

Reactions 54 Comments 1
9 min read

Building and Playing the Go Game with Phoenix LiveView

Reactions 52
7 min read

Inside Enumeration in Ruby

Reactions 67
6 min read

Iteration, recursion, and tail-call optimization in Elixir

Reactions 56 Comments 1
7 min read

Unraveling Classes, Instances and Metaclasses in Ruby

Reactions 45 Comments 2
5 min read

Serving Plug: Building an Elixir HTTP server from scratch

Reactions 87
9 min read

Bindings and Lexical Scope in Ruby

Reactions 33
5 min read

#discussWhat's your favorite Vim trick?

Reactions 38 Comments 30
1 min read

Running Rack: How Ruby HTTP servers run Rails apps

Reactions 84
9 min read

Building a 30 line HTTP server in Ruby

Reactions 86 Comments 4
8 min read

Consistent terminal colors with 16-ANSI-color Vim themes

Reactions 46
5 min read

Hot Code Reloading in Elixir

Reactions 46 Comments 7
8 min read

How OTP Applications are structured

Reactions 79 Comments 1
4 min read

Closures in Ruby: Blocks, Procs and Lambdas

Reactions 69 Comments 3
6 min read

JavaScript-sprinkled Rails Applications

Reactions 46 Comments 1
5 min read

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

Reactions 35 Comments 2
9 min read

Caching counters with ActiveRecord's counter caches

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6 min read

Deconstructing Elixir's GenServers

Reactions 21
7 min read

#discussWhat's your favorite editor/terminal color scheme?

Reactions 43 Comments 52
1 min read

Find, convert and replace dates with Vim substitutions

Reactions 17 Comments 3
6 min read

Ruby's magical Enumerable module

Reactions 35 Comments 2
6 min read

Speeding up your app’s navigation with Turbolinks

Reactions 33 Comments 2
3 min read

Ensuring execution, retrying failures and reraising exceptions in Ruby

Reactions 40
5 min read

Client-side caching in Rails: conditional GET requests

Reactions 44
4 min read

ActiveRecord performance: the N+1 queries antipattern

Reactions 74 Comments 3
6 min read

Rails' built-in cache stores: an overview

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4 min read

Rescuing exceptions in Ruby

Reactions 29
3 min read

Russian doll caching in Rails

Reactions 22
5 min read

Understanding system load and load averages

Reactions 71 Comments 2
4 min read
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