jonmagic

require "benchmark"
require "delegate"
require "forwardable"

class Person
  def initialize(name, ip)
    @name = name
    @ip = ip
  end

jonmagic

class Reputation
  class Error < StandardError; end

  def initialize(sample_size:, not_spammy_sample_size:)
    @sample_size = sample_size
    @not_spammy_sample_size = not_spammy_sample_size
  end

  attr_reader :sample_size
  attr_reader :not_spammy_sample_size

jonmagic

#include <math.h>

int BUTTON = D0;
int GREEN_LED = D1;
int RED_LED = A4;

int buttonState = 0;

// Takes the current hour (0-23) and multiplies it by 60 (minutes) and then
// adds the minutes after the hour (0-59.

jonmagic

# List unique values in a DataFrame column
# h/t @makmanalp for the updated syntax!
df['Column Name'].unique()

# Convert Series datatype to numeric (will error if column has non-numeric values)
# h/t @makmanalp
pd.to_numeric(df['Column Name'])

# Convert Series datatype to numeric, changing non-numeric values to NaN
# h/t @makmanalp for the updated syntax!

jonmagic

/***********************************
This is our GPS library

Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, check license.txt for more information
All text above must be included in any redistribution

jonmagic

$> brew cask install java

$> brew install kafka

$> vim ~/bin/kafka
# ~/bin/kafka
#!/bin/bash

zkServer start
kafka-server-start.sh /usr/local/etc/kafka/server.properties

jonmagic

testing

jonmagic

test

jonmagic

layout	title
post	Arca

Arca is a callback analyzer for ActiveRecord models ideally suited for digging yourself out of callback hell.

Arca was created in July of last year while I was working on tools for migrating customer data from github.com to GitHub Enterprise and for consolidating GitHub Enterprise instances. The tools we built had just shipped and as customers began using the tool we started getting reports that some imports were failing.

Our investigation into these bugs eventually led us to ActiveRecord callbacks. We found two patterns that I’d like to talk about.

jonmagic