edwinlab

Array.prototype.shuffle = function () {
  var i, j, tempi, tempj;
  i = this.length;
  if ( i === 0 ) {
    return false;
  }
  while ( --i ) {
    j = Math.floor( Math.random() * ( i + 1 ) );
    tempi = this[i];

edwinlab

/*
This snippet is an example of backpressure implementation in Go.
It doesn't run in Go Playground, because it starts an HTTP Server.

The example starts an HTTP server and sends multiple requests to it. The server starts denying
requests by replying an "X" (i.e. a 502) when its buffered channel reaches capacity.

This is not the same as rate-limiting; you might be interested in https://github.com/juju/ratelimit
or https://godoc.org/golang.org/x/time/rate.

edwinlab

/*
Parallel processing with ordered output in Go
(you can use this pattern by importing https://github.com/MarianoGappa/parseq)

This example implementation is useful when the following 3 conditions are true:
1) the rate of input is higher than the rate of output on the system (i.e. it queues up)
2) the processing of input can be parallelised, and overall throughput increases by doing so
3) the order of output of the system needs to respect order of input

- if 1 is false, KISS!

edwinlab

require 'openssl'

class String
  def encrypt(key)
    cipher = OpenSSL::Cipher::Cipher.new('DES-EDE3-CBC').encrypt
    cipher.key = Digest::SHA1.hexdigest key
    s = cipher.update(self) + cipher.final

    s.unpack('H*')[0].upcase
  end

edwinlab

#Laravel 5 Simple ACL manager

Protect your routes with user roles. Simply add a 'role_id' to the User model, install the roles table and seed if you need some example roles to get going.

If the user has a 'Root' role, then they can perform any actions.

Installation

Simply copy the files across into the appropriate directories, and register the middleware in App\Http\Kernel.php

edwinlab

JS_PATH = "app/assets/javascripts/**/*.js"; 
Dir[JS_PATH].each do |file_name|
  puts "\n#{file_name}"
  puts Uglifier.compile(File.read(file_name))
end

edwinlab

def self.escape_characters_in_string(string)
  pattern = /(\'|\"|\.|\*|\/|\-|\\|\)|\$|\+|\(|\^|\?|\!|\~|\`)/
  string.gsub(pattern){|match|"\\"  + match}
end

edwinlab

module Validate
  class Activity
    include ActiveModel::Validations

    attr_accessor :latitude, :longitude

    validates :latitude, presence: true, numericality: true
    validates :longitude, presence: true, numericality: true

    def initialize(params={})

edwinlab

class Person
  has_many :accounts
  has_many :computers, through: :accounts
end

class Account
  belongs_to :person
  belongs_to :computer

  scope :administrators, -> { where(role: 'administrator') }

edwinlab

Rails Migration

http://guides.rubyonrails.org/migrations.html

Migrations methods:

• add_column
• add_index
• change_column
• change_table
• create_table
• drop_table