plexus

# -*- coding: utf-8 -*-
# Quick rendition of Conway's game of life
class Grid
  attr_reader :width, :height
  CHARS=[
    ' ·•◌◉◍◎●',
    ' ·•◌◔◑◕◍●',
    ' ⚀⚁⚂⚃⚄⚅',
    ' ⚋⚊⚏⚍⚎⚌☷☳☵☶☱☲☴☰',
    ' ✡✢✣✤✥✦✧✨✩✪✫✬✭✮✯✰✱✲✳✴✵✶✷✸✹✺✻✼✽✾✿❀❁❂❃❄❅❆❇❈❉❊❋',

wavded

"use strict"
var Promise = function () {
  this.state = 'pending'
  this.thenables = []
}

Promise.prototype.resolve = function (value) {
  if (this.state != 'pending') return

  this.state = 'fulfilled'

plexus

Web Linguistics : Towards Higher Fluency

About the talk

The idea for this talk came with digging in to web security after last winter's Rails vulnerabilities. Whole categories of vulnerabilities are due to not properly escaping inputs, at least that is the common wisdom : ESCAPE ALL THE THINGS.

Fact is that having to do escaping manually will always be error prone. Using SafeBuffer to automatically escape in views/templates might seem like a good idea, but it's not addressing the structural problem : that we're manipulating structured data (like a DOM) as plain text.

It can be quite an epiphany to look at it from that angle. Plain text representations should be considered a serialization format. It is not sensible to write that by hand. It's more complex than is commonly acknowledged. What if you have a URL inside CSS inside JSON inside HTML?

plexus

require 'nokogiri'
require 'open-uri'

paragraphs = Nokogiri( open('http://en.wikipedia.org/wiki/Ruby_(programming_language)') )/'p'

# Print fromt the first paragraphs containing 'Google Tech Talk' to the first following paragraph containing 'mixins'

paragraphs.map(&:text).each do |p|
  puts p if (p =~ /Google tech talk/i)..(p =~ /mixins/i)
end

havenwood

line one
line two
line three

havenwood

array = (1..12).map &:to_s

class Array
  def insert_every n, this
    each_slice(n).inject { |r, a| r << this << a }.flatten
  end
end

array.insert_every 3, ','
#=> ["1", "2", "3", ",", "4", "5", "6", ",", "7", "8", "9", ",", "10", "11", "12"]

havenwood

module Enumerable
  def to_h
    Hash[*self]
  end
end

1.upto(4).to_h
#=> {1=>2, 3=>4}

[:first, 1, :second, 2].to_h

vinirodr

# ruby 1.9 - Argumentos Ordenados
def params_1_9(name, age)
  name = args[:name]
  age  = args[:age]

  puts name
  puts age
end

# ruby 2.0 - Argumentos Nomeados

havenwood

module Fibonacci
  refine Fixnum do
    def fibs
      a, b = 0, 1
      1.upto(self).with_object([]) do |_, array|
        array << a
        a, b = b, a + b
      end
    end
  end

havenwood

class Hash
  def map_value
    each_pair.with_object({}) do |(key, value), result|
      result[key] = yield value
    end
  end
  
  def map_key
    each_pair.with_object({}) do |(key, value), result|
      result[yield key] = value