Learn Go, Realm and Riot

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software. It is used frequently in the container ecosystem by projects such as Kubernetes (container orchestration), Docker (containers), and Cilium (BPF networking).

This playlist is a collection of videos that will start you off on your Golang journey.

Go is an open-source programming language that makes it easy to build simple, reliable, and efficient software.

Golang from Scratch

Go is a server-side language, but today we can compile Go code to WebAssembly as well - making it possible for us to bring programs written in minimalistic Go code into the browser!

With this collection, we will learn how to compile and run Go WebAssembly programs in Node.js and the browser, and how our Go code can interop with JavaScript and manipulate the DOM. We will also talk about configuring our VS Code workspace and optimizing the Go WASM binary size.

WebAssembly with the Go Language

This collection of lessons will cover a variety of topics that teach you how to work with slices and arrays in go. You'll learn how to declare them, create them using literal syntax, iterate over them, add to them, remove from them and other useful things.

Learn about slices and arrays in Go

Riot brings custom tags to all modern browsers. Think React + Polymer but with enjoyable syntax and a small learning curve.

riot

Tag Options allow you to abstract your custom tag elements into reusable objects by allowing the tag-user to specify the dynamic parameters of their component.

Riot JS - Tag Options

Getting started with Riot JS. We'll discuss riot's compile and mount process and build a small hello world component with simple data-binding.

Riot JS - Getting Started with this React-like micro-library

Riot can listen for raw dom events on any element by adding the on* attribute to elements and referencing an event handler. Let's walk through a couple examples.

Riot JS - DOM Events

It's easy to repeat over a collection and render many elements. Riot works very similar to Angular and has various syntaxes for it's each attribute. We'll look at the typical syntax for arrays, a shortened syntax, and an object key/value syntax.

Riot JS - Repeating Elements with Each Attribute

Riot takes a 'keep your styles close' approach with custom tags. You are encouraged to place your styles for a tags element right inline with the html and javascript. Learn how riot parses the inline styles as well as ways to keep your styles from bleeding out to the rest of your app. Scoped styles provide great isolation for your custom tag. Use the class attribute's special binding syntax to easily add and remove a class based on an expression.

Riot JS - Scoped CSS and Toggled Classes

Realm is a mobile database that runs directly inside phones, tablets or wearables. This project hosts the JavaScript versions of Realm. Currently we only support React Native (both iOS & Android) and Node.js (on MacOS and Linux) but we are considering adding support for Cordova/PhoneGap/Ionic as well.

realm

Realm is an ACID compliant object database. In this lesson, you will learn how to install Realm, define schemas for your data, perform CRUD operations and persist your data to the filesystem.

Use Realm Object Database with Node.js

Every tag in Riot has a lifecycle. I'll explore the three hooks: mount, update, and unmount while adding an animation feature for an existing tag. Lifecycle hooks are important for setting up, tearing down, and keeping a tag's view up to date after external logic is run.

Riot JS - Tag Life Cycle Hooks

Golang has testing tools built into the standard go tool and the standard library. Here is how to write a unit test on a function so that you can run it with `go test`.

Writing a Unit Test in Go

Functions are as useful in Go as many other programming languages. In this lesson we write a function that operates on numbers covering the func keyword, argument and return signatures, and writing the function body.

Writing a Function that Multiplies a Number by Two in Go

We'll cover a small Golang program that prints a string to the terminal, showing how to set up an executable program, import a package, and build a binary.

Getting Started with Hello World in Go

Returning multiple values from a function is a common idiom in Go, most often used for returning values along with potential errors. We'll go over how to return multiple values from a function and use those values in our program.

Returning Multiple Values from a Function in Go

iota is a constant generator that can be used to construct enums. It is effectively an infinite list that starts at 0 that can be used to produce a value for a set of constants.

iota, The Golang Constant Generator

Constants are expressions whose values are known at compile time, which means that we can generate errors for expressions using those constants at compile time as well, instead of runtime.

Golang Constants Basics

Golang includes the `go mod` command to initialize a new project. Sometimes that command fails even though it tries to be smart about where to get the name of your module from so we give an example of how to explicitly set the name of your go modules based project.

```shell
mkdir my-go-project
cd my-go-project
go mod init github.com/christopherbiscardi/my-go-project
```

Initializing a project using Go modules

Golang has no built-in function(s) to filter an array. This lesson will teach you two different ways to filter.

The first is to create a separate array and add the filtered elements to it. This works great, but doesn't use memory as efficiently as the second way.

The second way shows you how to filter by altering the original array in place without making another array to hold the filtered elements. But, it has a side-effect that I'll tell you about which may help you decide which approach you will use to filter your array. 

Filter an Array in Go

There is a built-in append function that is used to append elements to a slice. We'll see in this lesson that the append function works only with slices, not arrays. There are also some nifty alternate uses of the the append function that make appending super easy.

Checkout the sample code in my [github repo](https://github.com/JeffBNimble/GoLessons/tree/master/Array-Add).

Append Elements to a Slice in Go

Go has a special indexing syntax that forms the basis of removing one or more elements from a slice. I will teach you this syntax and show you its various forms.

Based upon that, I'll show you how to remove a single element from a slice. However, you may find this somewhat limiting. I also will show you a more typical example of removing elements from a slice as we iterate over it. This technique shows you how to remove multiple elements from a slice.

Remove Elements from a slice in Go

There are numerous ways that you can declare and create arrays and slices in Go. This lesson will show you several and I talk about the advantages and disadvantages of one over another. After watching, you will better understand all of the possible ways you can declare/create as well as the idiomatic way.

These include:

* var
* the built-in function *new*
* the built-in function *make*
* Array and Slice literals

While it is not the main intent of this lesson, I do touch on some of the differences between slices and arrays.

Checkout the code in my [github repo](https://github.com/JeffBNimble/GoLessons/tree/master/Array-Declare).