thiagoa

require 'delegate'

module ConcatHelper
  def concat(*elements, separator)
    elements.reject(&:blank?).join(separator)
  end

  def format(format_string, string)
    format_string % string unless string.blank?
  end

thiagoa

class Obj 
  attr_reader :a

  def initialize(a)
    @a = a
  end
  
  def ==(other)
    a == other.a
  end

thiagoa

Types of index scans

Indexes

Sequential Scan:

• Read every row in the table
• No reading of index. Reading from indexes is also expensive.

thiagoa

import time


class ContextManager():
    def __init__(self, generator_method, args, kwargs):
        self.generator_method = generator_method
        self.args = args
        self.kwargs = kwargs

    def __enter__(self):

thiagoa

defmodule FizzBuzz do
  defmacro __using__(_) do
    quote do
      alias FizzBuzz.FunctionSignaturePatternMatching, as: FSPM
      alias FizzBuzz.GuardClause
      alias FizzBuzz.Case
      alias FizzBuzz.Cond
      alias FizzBuzz.If

      import FizzBuzz.AnonymousFunction

thiagoa

" How to process a set of files (includes escaping file name) and populate the arglist
" This example "copies" everything from quickfix to arglist
command! -nargs=0 -bar Qargs execute 'args' QuickfixFilenames()
function! QuickfixFilenames()
  let buffer_numbers = {}
  for quickfix_item in getqflist()
    let buffer_numbers[quickfix_item['bufnr']] = bufname(quickfix_item['bufnr'])
  endfor
  return join(map(values(buffer_numbers), 'fnameescape(v:val)'))
endfunction

thiagoa

# this was copied from https://carc.in/#/r/fg2
# thanks to @waterlink from this issue thread https://github.com/crystal-lang/crystal/issues/1388
module CrChainableMethods
  module Pipe
    macro pipe(ast)
      {% uast = ast.stringify.gsub(/ >>/, ".pipe").id %}
      {% pp uast %}

      {% if uast.stringify != ast.stringify %}
        pipe {{uast}}

thiagoa

Adding Sinon to WebPack

• Open your project (if you're using WebPack, obviously)

• npm install sinon --save-dev

• You should now have Sinon in your node modules and listed in your package.json file

• In your tests, require Sinon: var sinon = require('sinon');

thiagoa

<!-- app/views/home/index.html.erb -->
<div data-twitter-app>
  <div data-tweets>
  </div>
</div>

thiagoa

# spec/features/twitter_timeline_spec.rb
require 'feature_helper'

RSpec.feature 'twitter timeline' do
  scenario 'a user views a twitter timeline' do
    pending

    visit root_path

    within '[data-twitter-app]' do