jeffreyiacono

​String.prototype.times = function(n) {
  // join checks its first argument for a length property, so we supply it with one.
  // what normally happens is something like this:
  //
  //   [1, 2, 3].length //=> 3
  //   [1, 2, 3].join(", ") //=> "1, 2, 3"
  //
  // so the following is equivalent ...
  //
  //  Array.prototype.join.call([1, 2, 3], ", ") //=> "1, 2, 3"

jeffreyiacono

class SqlQuery; end

query = SqlQuery.new

puts "String === query is #{String === query}"
#=> String === query is false

String.extend Module.new {
  def ===(obj)
    obj.instance_of?(SqlQuery) or super

jeffreyiacono

// via https://gist.github.com/4080907
Object.defineProperty(window, 'log', {
  set: function(args) {
    console.log.apply(console, Array.isArray(args) ? args : [args]);
    this.value = args
  },
  get: function() {
    return this.value + " from .get";
  }
});

jeffreyiacono

some_guy = 'Fred'

first_names = []
first_names.append(some_guy)

another_list_of_names = first_names
another_list_of_names.append('George')

some_guy = 'Bill'

jeffreyiacono

# fun with the new lambda syntax
adder = ->(a, b) { a + b }
subtr = ->(a, b) { a - b }
divdr = ->(a, b) { a / b }
multr = ->(a, b) { a * b }

puts "adder.(4, 2) = #{adder.(4, 2)}"
puts "subtr.(4, 2) = #{subtr.(4, 2)}"
puts "divdr.(4, 2) = #{divdr.(4, 2)}"
puts "multr.(4, 2) = #{multr.(4, 2)}"

jeffreyiacono

# Date.new will be the beginning of time
# Date::Infinity.new will be the end of time
require 'date'

case Date.parse(ARGV[0])
when Date.new..Date.new(1983, 1, 15)
  puts "pre-Iacono"
when Date.new(1983, 1, 15)..Date::Infinity.new
  puts "post-Iacono"
end

jeffreyiacono

# encoding: UTF-8

class Weather
  def ☃
    "I'm a snowman!"
  end

  def ☁
    "Looking like a cloudy day"
  end

jeffreyiacono

require 'net/http'
require 'uri'
require 'io/console'

puts "Enter in a github username:"
gh_username = gets.chomp
puts "Enter in the github user password (hidden):"
gh_password = STDIN.noecho(&:gets).chomp

uri = URI.parse('https://api.github.com/user')

jeffreyiacono

#!/bin/sh

echo "you passed me $# args"
echo "pid = $$"
echo "and I am $0"

for a in $@
do
  echo $a
done

jeffreyiacono

# round 1! => nonblocking example
[process a] $ flock -en sleeper.lock ./sleeper.sh
time to sleep ...
[process b] $ flock -en sleeper.lock ./sleeper.sh
# ^ will exit b/c of n switch: "Fail (with an exit code of 1) 
#   rather than wait if the lock cannot be immediately acquired.
... waking up # <= process a returning


# round 2! => blocking example