osazemeu

Write a function that takes three arguments, 2 arrays (a and b) and 1 integer (c) then returns one array (d) which is created by inserting all elements in b into a at indexes which are spaced by the integer value.

Consider all possible corner cases.
e.g
a = ["a", "b", "c", "d", "e", "f"]
b = ["1", "2", "3"]
c = 2

d = ["a", "b", "1", "c", "d", "2", "e", "f", "3"]

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

#! /bin/bash

# Shell script to install apache/mysql/php/wordpress into an EC2 instance of Amazon AMI Linux.
# Step 1: Create an AWS EC2 instance
# Step 2: ssh in like: ssh -v -i wordpress.pem ec2-user@ec2-54-185-74-0.us-west-2.compute.amazonaws.com
# Step 3: Run this as root/superuser, do sudo su

echo "Shell script to install apache/mysql/php/wordpress into an EC2 instance of Amazon AMI Linux."
echo "Please run as root, if you're not, choose N now and enter 'sudo su' before running the script."
echo "Run script? (y/n)"

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

//Javascript stack linked list data structure (no array)

function node(value, noderef) {
    this.value = value;
    this.next = noderef;
}
function stack() {
    this.push = function (value) {
        this.next = this.first;
        this.first = new node(value, this.next);

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()

osazemeu

#!/bin/bash
# Updates all EC2 instances from git
# Author: anton@sothree.com

CODE_LOCATION=/var/www/your_project
SERVER_PREFIX=your_project

# exit if something fails
set -e