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The Archives

Pagination in Scala with Slick

Published: 9/2/2019

Pagination is the idea that a list of content can be broken into separate pages. When I first heard of pagination, the common practice was to use query params to influence which rows of content was loaded by the server. If you clicked the “next” button on the page, it would reload the page with new query params. Fundamentally, pagination hasn’t changed much, but the landscape in which it exists has changed drastically. While some monolithic apps are still built today, the pattern for modern web…

Go's Athens Project

Published: 8/26/2019

I recently got back from Gophercon in San Diego and am still excited about the talk on the Athens Project. For those unaware, the Athens Project is a module proxy for Go! It’s currently in beta, but showing a ton of promise already. Go’s dependency management has changed a lot over the past few years. For simplicity, Go allowed you to simply specify your dependencies in your code as an import. go get would then get all the dependencies that your application needed. This worked, for a while…

A Beginner's Guide to Java Enums

Published: 8/5/2019

An Enum in Java is a special data type that encompasses a set of predefined constants. When setting a variable of that Enum type, you have to use one of the constants that you define for it. A great example is the compass: In the above example, we create a new enum and it’s predefined set of constants. Then we create a variable of that enum type, and assign it to one of the constants. Keep in mind that we can only set our direction to Compass.NORTH , Compass.SOUTH , Compass.EAST , Compass…

Testing a Cobra CLI in Go

Published: 7/18/2019

Go has a fantastic library for writing CLI’s (Command Line Interfaces) called Cobra . I’ve been working on a CLI named Deckard for a few months now. Being new to Go, I had (lazily) shied away from writing tests. However, after thinking about my test plan and doing a little refactoring, I’ve found a great way to handle testing your Cobra CLI application. The idea behind Cobra is that you simply write “Command” functions. These command functions are then called by the Cobra library when it…

How Golang Interfaces Work

Published: 7/8/2019

Interfaces are a tool that allows you to define the behavior of objects and in Golang, interfaces are no different (except that they work on structs instead of “objects”). However, Go has some strange features for interfaces that users from other languages might not expect. Let’s take it slow and start by defining an interface in Go: This fairly simple interface defines what a sandwich is capable of. Not what it looks like, not how it’s composed, but for the purposes of our application it’s all…

Golang: What is a receiver function?

Published: 6/30/2019

Classes aren’t really a thing in go, so you cant have instance methods ( like Java or similar ), however, you may have noticed some functions in Go that appear to be instance methods. These are Go’s receiver functions . The way they work is quite simple. If you have a struct like so: You could write a function that takes the struct in as a parameter. For example: Go’s receiver function However, Go gives us the ability to specify that getDatabaseRoot is a function that belongs to that Struct…