danhodge

# Use .transpose to 'unzip' an array of arrays
[ [ 1, 'a' ], [ 2, 'b' ], [ 3, 'c' ] ].transpose  # => [ [ 1, 2, 3 ], [ 'a', 'b', 'c' ] ]

danhodge

# Print a 32-bit integer as an 8 character hex string
"%08X" % 65535   # => "0000FFFF"

danhodge

require 'rubygems'
require 'active_support'

module Attrs
  extend ActiveSupport::Concern

  module ClassMethods
    def add_public_accessor(name)
      add_accessor(name)
    end

danhodge

# run from the console of your Rails project

param_filter = ActionDispatch::Http::ParameterFilter.new([:foo, :bar])
param_filter.filter("foo" => "hi")  # => {"foo"=>"[FILTERED]"}
param_filter.filter("BAR" => "123")  # => {"BAR"=>"[FILTERED]"}
param_filter.filter("Food" => "nachos")  # => {"Food"=>"[FILTERED]"}
param_filter.filter("hobart" => "australia")  # => {"hobart"=>"[FILTERED]"}

danhodge

  describe MessageReceiver do 
    context 'with a hello message' do 
      let(:message) { "hello" } 

      it 'responds accordingly' do 
        subject.receive(message).should == 'is it me your looking for?'
      end
    end
  end

danhodge

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

danhodge

class Monad
  def self.unit(value)
    monad = new
    monad.define_singleton_method(:bind) { |func, *args| func.call(*([value] + args)) }

    monad
  end

  def lift(name, func, *args)
    define_singleton_method(name) { Monad.unit(bind(func, args)) }

danhodge

"J\u00e4germeister"  # => "Jägermeister"
"Caf\u00e9" # => "Café"

danhodge

require 'forwardable'

class Foo
  extend Forwardable

  # Note: def_delegators, not def_delegator
  def_delegators :ar, :size, :map
  def ar
    [1, 2, 3]
  end

danhodge

# require 'active_support'

# Monday, August 3, 2014

today = Date.today #=> Mon, 04 Aug 2014
Date.yesterday #=> Sun, 03 Aug 2014
Date.tomorrow #=> Tue, 05 Aug 2014

# this week
today.beginning_of_week #=> Mon, 04 Aug 2014