osazemeu

Rails naming conventions

General Ruby conventions

Class names are CamelCase.

Methods and variables are snake_case.

Methods with a ? suffix will return a boolean.

osazemeu

Example inputs:

Variable	Value
key	the shared secret key here
message	the message to hash here

Reference outputs for example inputs above:

| Type | Hash |

osazemeu

#!/usr/bin/env sh

# checks to see if running 
launchctl list | grep elasticsearch
 
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.elasticsearch.plist
launchctl remove homebrew.mxcl.elasticsearch

pkill -f elasticsearch

osazemeu

# This solution attempts to handle flattening of nested arrays gracefully
class CustomArray
  def flatten(array)
    raise 'input is not an array' unless array?(array)
    return [] if array.empty?

    recursive_flatten(array)
  end

  private

osazemeu

Over the weekend I spun up a new Elixir :ecto, "2.2.7" project that I was able to get working with CockroachDB and this adapter fork - with some caveats I wanted to share to help others.

1. Only the root user can create databases This requires you configure the Ecto.Adapters.Postgres username as root or else the mix ecto.create command will always fail. You can go back and change your configured username to something else after the database has been created, or create your database and user permissions using cockroach sql and skip the mix ecto.create command.

2. Configuring Ecto primary_key ID to be created by CockroachDB By default when configuring your Ecto.Schema using autogenerate: false it appears either CockroachDB, Ecto or the Postrex adapter (I did not investigate this) uses the BIGINT unique_rowid() function as the default value for IDs

@primary_key {:id, :id, autogenerate:

osazemeu

Latency Comparison Numbers

Note: "Forked" from Latency Numbers Every Programmer Should Know

Event	Nanoseconds	Microseconds	Milliseconds	Comparison
L1 cache reference	0.5	-	-	-
Branch mispredict	5.0	-	-	-
L2 cache reference	7.0	-	-	14x L1 cache
Mutex lock/unlock	25.0	-	-	-

osazemeu

S3 Static Sites

What this will cover

• Host a static website at S3
• Redirect www.website.com to website.com
• Website can be an SPA (requiring all requests to return index.html)
• Free AWS SSL certs
• Deployment with CDN invalidation

Resources

osazemeu

// bower dependency: "ng-file-upload"
// npm dependency: "loopback-component-storage"

'use strict';

angular
  .module('app', [
    'ngFileUpload'
  ])
  .controller('UploadController', function(Upload) {

osazemeu

[1,2,3].map{|x| x.to_s}
[1,2,3].map(&:to_s)
Proc.new{|x| x.to_s}

def sym_to_proc(sym)
	Proc.new{ |x| x.send(sym) }
end
sym_to_proc(:to_s).call(3)
:to_s.to_proc.call(3)
[1,2,3].map &->(n) { n.to_s }

osazemeu

// This function takes a contents object with a files array.
// The goal is to cache each file details in redis then replace
// the file's path with a secure, obscured url.

// Finally the contents object is returned with the updated array
// in place of the old one.

// async = require('async')
// uuid = require('node-uuid')
// redis.client = require('node-redis').createClient()