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Jeff Kreeftmeijer

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

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How To Reduce Reductions in Elixir

How To Reduce Reductions in Elixir

1
Comments
6 min read

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Emacs package management with straight.el and use-package

Emacs package management with straight.el and use-package

7
Comments 1
5 min read
Combine Git repositories with unrelated histories

Combine Git repositories with unrelated histories

6
Comments
2 min read
Testing input and output in Rust command line applications

Testing input and output in Rust command line applications

18
Comments
4 min read
Embrace email, mute Slack. A policy for handling incoming messages

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

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

66
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

54
Comments 1
9 min read
Building and Playing the Go Game with Phoenix LiveView

Building and Playing the Go Game with Phoenix LiveView

52
Comments
7 min read
Inside Enumeration in Ruby

Inside Enumeration in Ruby

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

Iteration, recursion, and tail-call optimization in Elixir

52
Comments 1
7 min read
Unraveling Classes, Instances and Metaclasses in Ruby

Unraveling Classes, Instances and Metaclasses in Ruby

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

Serving Plug: Building an Elixir HTTP server from scratch

88
Comments
9 min read
Bindings and Lexical Scope in Ruby

Bindings and Lexical Scope in Ruby

34
Comments
5 min read
What's your favorite Vim trick?

What's your favorite Vim trick?

41
Comments 32
1 min read
Running Rack: How Ruby HTTP servers run Rails apps

Running Rack: How Ruby HTTP servers run Rails apps

90
Comments
9 min read
Building a 30 line HTTP server in Ruby

Building a 30 line HTTP server in Ruby

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

Consistent terminal colors with 16-ANSI-color Vim themes

47
Comments
5 min read
Hot Code Reloading in Elixir

Hot Code Reloading in Elixir

50
Comments 7
8 min read
How OTP Applications are structured

How OTP Applications are structured

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

Closures in Ruby: Blocks, Procs and Lambdas

75
Comments 3
6 min read
JavaScript-sprinkled Rails Applications

JavaScript-sprinkled Rails Applications

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

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

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

Caching counters with ActiveRecord's counter caches

12
Comments
6 min read
Deconstructing Elixir's GenServers

Deconstructing Elixir's GenServers

24
Comments
7 min read
What's your favorite editor/terminal color scheme?

What's your favorite editor/terminal color scheme?

44
Comments 53
1 min read
Find, convert and replace dates with Vim substitutions

Find, convert and replace dates with Vim substitutions

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

Ruby's magical Enumerable module

33
Comments 2
6 min read
Speeding up your app’s navigation with Turbolinks

Speeding up your app’s navigation with Turbolinks

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

Ensuring execution, retrying failures and reraising exceptions in Ruby

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

Client-side caching in Rails: conditional GET requests

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

ActiveRecord performance: the N+1 queries antipattern

69
Comments 3
6 min read
Rails' built-in cache stores: an overview

Rails' built-in cache stores: an overview

13
Comments
4 min read
Rescuing exceptions in Ruby

Rescuing exceptions in Ruby

29
Comments
3 min read
Russian doll caching in Rails

Russian doll caching in Rails

21
Comments
5 min read
Understanding system load and load averages

Understanding system load and load averages

71
Comments 2
4 min read
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