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David Butler dwbutler

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dwbutler / gist:9774171
Created March 26, 2014 00:03
Benchmark a constant vs a method
RUBY_VERSION
# => "2.1.1"
require 'benchmark'
DEFAULT_OPTIONS = {validate: true}
def default_options
{validate: true}
end
@dwbutler
dwbutler / Cost of defined? in JRuby.rb
Last active December 29, 2015 19:18
Cost of defined? in JRuby
require 'benchmark'
Benchmark.bm {|x| x.report { 1_000.times { defined?(::UNF::Normalizer) } } }
user system total real
0.300000 0.010000 0.310000 ( 0.340000)
@dwbutler
dwbutler / db.rake
Created August 28, 2013 22:56 — forked from ches/db.rake
namespace :db do
desc 'Open a MongoDB console with connection parameters for the current Rails.env'
task :console, [:session] => :environment do |t, args|
session_name = args[:session] || :default
config = Mongoid.sessions[session_name]
username = config[:username]
password = config[:password]
database = config[:database]
@dwbutler
dwbutler / JSON_gem.rb
Last active December 11, 2015 17:08
Trying to reproduce a JSON.dump bug in JRuby
rvm use jruby
gem install json
Successfully installed json-1.7.6-java
1 gem installed
# Uses JSON prepackaged with JRuby?
➜ ~ jruby -r 'json' -r 'active_support/hash_with_indifferent_access' -e "puts JSON::VERSION; puts JSON.dump HashWithIndifferentAccess.new"
1.7.5
{}
@dwbutler
dwbutler / private_protected.rb
Last active September 3, 2018 07:59
Demonstrates behavior of private and protected methods in child classes in Ruby (including some surprising behavior and pitfalls)
# Tested in Ruby 1.8.7
class ParentClass
def call_private_good
# Private methods can only be called without an explicit receiver
private_test
end
def call_private_bad
# Calling a private method with an explicit receiver (self) will fail
@dwbutler
dwbutler / gist:4499941
Last active December 10, 2015 22:08
Trying to get RDF::Raptor to run under FFI 1.3.0. This gist documents https://github.com/ffi/ffi/issues/245

##Issue ffi/ffi#245

TypeError: no implicit conversion from nil to integer

##Platform

uname -a
Darwin dbutler.local 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64
@dwbutler
dwbutler / 0. Platform
Last active December 10, 2015 21:48
Trying to get FFI working with the latest version of Rubinius
uname -a
Darwin dbutler-mac-2.local 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64