al2o3cr

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  # NOTE: tests pass on 4.1.x, fail on 4.2

al2o3cr

GC.start
first_count = ObjectSpace.each_object(String) { |x| nil }

def dummy_function
  'foo'
end

second_count = ObjectSpace.each_object(String) { |x| nil }
GC.start
second_after_gc_count = ObjectSpace.each_object(String) { |x| nil }

al2o3cr

require 'benchmark'

nelements = 10
nlines = 10

def repeating_string(base, elements, lines)
  (([base]*elements).join(',')+"\n")*lines
end

# test string

al2o3cr

Inspired by Postgres: The Bits You Haven't Found:

\set n 1000;

SELECT 4*COUNT(DISTINCT(x, y))/(1.0*:n*:n) AS result FROM generate_series(0,:n) AS x, generate_series(0,:n) AS y WHERE x*x + y*y <= :n*:n;

This uses the simple method of checking every integer-valued point in [0,n] x [0,n] to see if it's inside the circle - the Wikipedia approximations to pi article has more details.

al2o3cr

require 'bigdecimal'

def to_decimal(digits, dp)
  digits = digits.dup
  if dp < -digits.length
    digits.unshift(*([nil]*(-digits.length-dp)))
  end
  digits.insert(dp+digits.length, '.').map { |x| x || '0' }.join
end

al2o3cr

require 'thwait'

class Voice
  BASELINE = %w( there is no - poop ing - on - the  bus - )
  VOICES   = `say -v '?'`.lines.map { |line| line.split.first }

  attr_reader :voice_name, :rate

  def initialize(voice_name, rate)
    @i = 0

al2o3cr

💩 🚌👏

A programmatic reinterpretation of Steve Reich's Clapping Music

A variation on code from https://gist.github.com/jamesdabbs/a85fa5553df7dba0ba3dbb25f4cafe4b

Based on code & ideas from @celeenr's (https://twitter.com/celeenr) RubyConf 2016 talk "Rhythmic Recursion"

Try different voices for say.

al2o3cr

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "http://rubygems.org"
  # Activate the gem you are reporting the issue against.

al2o3cr

# frozen_string_literal: true

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do

al2o3cr

Reducing STI memory usage

if there are many STI child classes, ActiveRecord generates methods for each one individually. This is wasteful in the typical case, since all the children share the same underlying columns.

The small patch included here causes those methods to instead be generated in the parent class, shared amongst all the subclasses.

DO NOT use this if you call methods like attribute :foo to adjust the typecasting of columns in individual models.