We start by adding our imports.

1import java.nio.charset.StandardCharsets
2import java.security.Key
3import java.util.Base64
4import javax.crypto.Cipher
5import javax.crypto.spec.SecretKeySpec

For this example we’re going to use the CBC (Cipher …

In this article we are going to set up dynamodb on our local development environment. A short description of a couple of easy-to-use management tools is included.

DynamoDB

Start by downloading the DynamoDB development version. Uncompress the file and …

We are going to cite the definition of a Monoid found on this post:

Conceptually, a monoid is anything that:

- Has a "zero-value": `mempty`, e.g., `0`
- Can be "appended" together: `mappend`, e.g., `+`
- Has an identity with the …

Files and project structure

sbt projects use the same structure as Maven. Creating a project from scratch involve the following steps:

1mkdir some-new-project
2cd some-new-project
3mkdir -p src/{main,test}/{resources,scala}
4mkdir project

Create a …

In this article we are going to use scala to send a message via Telegram. The process is very simple and pretty much involves setting up a bot and making a GET request to Telegram’s api.

The Telegram app on the phone has more features than its …

A fat jar is a jar file that contains any dependencies required by a Java or Scala program. Deployment becomes an easy task if we only have to deal with one single file. In this article we’ll go through the steps required to create a fat jar …

On this article we’re going to set up Metatrader for email sending. This is recommended so you don’t miss important messages happening to your account.

Getting a password from Google

If you want to connect your Google email account, you …

The BatchWriteItem operation allows us to work with groups of up to 25 items per request. Additionally, we can put and delete items to one or multiple tables. Amazon DynamoDB’s page says:

A single call to BatchWriteItem can write up to 16 MB …

A command so important, it deserves its own page:

1git reset --soft HEAD~1

The previous command undoes the last commit to git. I think this is one of those commands that I have typed many times during the last year. It’s very important to know …

Should I use a map or a list? A simple rule:

• If you need to update or remove an item, lists only allow you to do it by index. While maps let you do it by key.

Their simplified representation goes like this:

1{
2  "someMap": {
3 …