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Jeff Kreeftmeijer profile picture

Jeff Kreeftmeijer

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

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

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

Reactions 3 Comments
3 min read
Multiplayer Go with Elixir's Registry, PubSub and dynamic supervisors

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

Reactions 64 Comments
10 min read
Building the Go Game in Elixir: Time Travel and the Ko Rule

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

Building and Playing the Go Game with Phoenix LiveView

Reactions 52 Comments
7 min read
Inside Enumeration in Ruby

Inside Enumeration in Ruby

Reactions 67 Comments
6 min read
Iteration, recursion, and tail-call optimization in Elixir

Iteration, recursion, and tail-call optimization in Elixir

Reactions 51 Comments 1
7 min read
Unraveling Classes, Instances and Metaclasses in Ruby

Unraveling Classes, Instances and Metaclasses in Ruby

Reactions 45 Comments 2
5 min read
Serving Plug: Building an Elixir HTTP server from scratch

Serving Plug: Building an Elixir HTTP server from scratch

Reactions 87 Comments
9 min read
Bindings and Lexical Scope in Ruby

Bindings and Lexical Scope in Ruby

Reactions 33 Comments
5 min read
What's your favorite Vim trick?

What's your favorite Vim trick?

Reactions 41 Comments 31
1 min read
Running Rack: How Ruby HTTP servers run Rails apps

Running Rack: How Ruby HTTP servers run Rails apps

Reactions 89 Comments
9 min read
Building a 30 line HTTP server in Ruby

Building a 30 line HTTP server in Ruby

Reactions 88 Comments 4
8 min read
Consistent terminal colors with 16-ANSI-color Vim themes

Consistent terminal colors with 16-ANSI-color Vim themes

Reactions 47 Comments
5 min read
Hot Code Reloading in Elixir

Hot Code Reloading in Elixir

Reactions 48 Comments 7
8 min read
How OTP Applications are structured

How OTP Applications are structured

Reactions 73 Comments 1
4 min read
Closures in Ruby: Blocks, Procs and Lambdas

Closures in Ruby: Blocks, Procs and Lambdas

Reactions 73 Comments 3
6 min read
JavaScript-sprinkled Rails Applications

JavaScript-sprinkled Rails Applications

Reactions 46 Comments 1
5 min read
Under the Hood: “Slurping” and Streaming Files in Ruby

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

Reactions 35 Comments 2
9 min read
Caching counters with ActiveRecord's counter caches

Caching counters with ActiveRecord's counter caches

Reactions 12 Comments
6 min read
Deconstructing Elixir's GenServers

Deconstructing Elixir's GenServers

Reactions 22 Comments
7 min read
What's your favorite editor/terminal color scheme?

What's your favorite editor/terminal color scheme?

Reactions 43 Comments 52
1 min read
Find, convert and replace dates with Vim substitutions

Find, convert and replace dates with Vim substitutions

Reactions 17 Comments 3
6 min read
Ruby's magical Enumerable module

Ruby's magical Enumerable module

Reactions 32 Comments 2
6 min read
Speeding up your app’s navigation with Turbolinks

Speeding up your app’s navigation with Turbolinks

Reactions 33 Comments 2
3 min read
Ensuring execution, retrying failures and reraising exceptions in Ruby

Ensuring execution, retrying failures and reraising exceptions in Ruby

Reactions 40 Comments
5 min read
Client-side caching in Rails: conditional GET requests

Client-side caching in Rails: conditional GET requests

Reactions 44 Comments
4 min read
ActiveRecord performance: the N+1 queries antipattern

ActiveRecord performance: the N+1 queries antipattern

Reactions 75 Comments 3
6 min read
Rails' built-in cache stores: an overview

Rails' built-in cache stores: an overview

Reactions 13 Comments
4 min read
Rescuing exceptions in Ruby

Rescuing exceptions in Ruby

Reactions 29 Comments
3 min read
Russian doll caching in Rails

Russian doll caching in Rails

Reactions 21 Comments
5 min read
Understanding system load and load averages

Understanding system load and load averages

Reactions 71 Comments 2
4 min read
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