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defined_indexes = Model.index_specifications.map { |s| s.fields.map(&:to_s) };
existing_indexes = Model.collection.indexes.map { |i| i['key'].keys };

missing_indexes = defined_indexes - existing_indexes
# => []
extra_indexes = existing_indexes - defined_indexes - [['_id']]
# => []

#################################################################################

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# gem install benchmark-ips
require 'benchmark/ips'

Benchmark.ips do |x|
  x.warmup = 0

  x.report("threads") do
    thread = Thread.new { puts 'thread' }
    thread.join
  end

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Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

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source 'https://rubygems.org'

gem 'puma'

gem 'sinatra'

gem 'faraday'
gem 'typhoeus'

group :development do

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class MemoryMiddleware
  ENV_REQUEST_PATH = 'REQUEST_PATH'.freeze
  ENV_PUMA_AFTER_REPLY = 'rack.after_reply'.freeze
  LOGGER = Logger.new('/tmp/memory.log'.freeze)

  def initialize(app)
    @app = app
  end

  def call(env)

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(export LC_ALL="ru" ; awk '{split($0,l,";") ; print l[2],l[3],l[4]}' ~/.zsh_history | sort | uniq -c | sort -nr | head -n 20)

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require "net/http"
require "socket"

socket = "/tmp/portal2.sock"

sock = Net::BufferedIO.new(UNIXSocket.new(socket))
request = Net::HTTP::Get.new("/")
request.exec(sock, "1.1", "/")

begin

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# HACK to enable using protected methods from Rails 4.2 and initial states as default attributes for ActiveRecord
module StateMachine
  module Integrations
    module ActiveModel
      public :around_validation
    end

    module ActiveRecord
      public :around_save

exAspArk

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

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# http://stackoverflow.com/questions/14972253/simpleform-default-input-class
# https://github.com/plataformatec/simple_form/issues/316

# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
  config.boolean_style = :nested
  
  config.wrappers :bootstrap3, tag: 'div', class: 'form-group', error_class: 'has-error',
      defaults: { input_html: { class: 'default_class' } } do |b|