Recent Articles

What Does the Tilde Mean in Go Generics

Go's generics use the tilde (~) character to represent types that have a specific underlying type. In this article we explore that in a bit more depth, looking at examples of where this can be useful to make generic functions even more powerful.

Crash Course on Go Generics

Generics provide a way to write type-safe code in a statically typed language like Go. In this article we explore how generics work, use cases for using generics, and some common misconceptions that beginners to generics may have.

Crash Course on Go Interfaces

Interfaces in Go are going to be a foreign concept to many developers. For many, they will be coming from dynamic languages where interfaces aren't necessary, and for the devs coming from languages like Java they will have to drastically adjust their mindset to take advantage of Go's unique approach to interfaces. In this article we start diving into how those interfaces work.

Concurrency Patterns in Go: sync.WaitGroup

Learn how to use sync.WaitGroup in concurrent Go code to wait for a group of goroutines to finish before proceeding with the rest of your code (or terminating the program if in main).

Database Migrations in Go

When transitioning to Go from another language that relies heavily on a framework, it can quickly start to feel like Go is lacking. Like it just doesn’t have the power or the tools that you are accustomed to. The end result is the language can feel confusing and clunky. One example of this is database migration tooling. If you are coming from a framework like Rails, Django, Flask, Laravel, or really any web framework, you very likely have an idea of what I am talking about.

Testing API Libraries

Nearly all apps need to talk other apps via API. In many cases we end up writing those API libraries on our own, which means we need to come up with a reliable way to test that code. In this article we explore techniques and advice that make it easier to test and maintain API client libraries written in Go.

Popular Articles

6 Tips for Using Strings in Go

Learn how to perform common operations with strings in Go. This article discusses how to write multiline strings, concatenate strings efficiently, convert various data types into strings, checking for prefixes, and converting strings to byte slices.

Using Functions Inside Go Templates

Go's template package provides many useful built-in functions. Learn to use a few of the more common ones, as well as how to add custom fucntions to your templates so that you can add any functionality you need.

Connecting to a PostgreSQL database with Go's database/sql package

This tutorial explains how to connect to a Postgres DB using the database/sql and lib/pq packages. It also covers potential errors and solutions.

Creating Random Strings in Go

A tutorial explaining how to create a custom rand package with functions for creating random strings of varying length with custom of preset character sets.

Inserting records into a PostgreSQL database with Go's database/sql package

Learn to insert new records into a Postgres database using Go's database/sql package, along with how to get the resulting ID of newly created records.

How to use slice capacity and length in Go

Learn about the difference between capacity and length and how to properly utilize them to make your Go code faster, cleaner, and memory efficient.

My Latest Progress Update

Writing Course Notes

In this progress update we explore why it takes me so long to complete a project when using it to come up with course notes. I'll also give you an inside look at my notes that I use for courses.

View past progress updates

↓ Or check out some of my longer series. ↓

Each series covers a broader topic and is composed of several articles

Using PostgreSQL with Go

PostgreSQL is an open source relational database system that has been around for well over a decade and has proven to be a great all around storage choice when developing a web application.

In this series we are going to walk through everything from first installing PostgreSQL 9.5 all the way to using it with a Go application. While this post will cover all of the basics required to get started using SQL with Golang, it is not a full course on SQL. It is instead intended to guide you by giving you enough information to be productive, while not overloading you with details that can be learned as you progress.

In this series we will cover topics like:

  • Installing PostgreSQL on various operating systems (Ubuntu Linux, Mac OS, etc)
  • Interacting with a PostgreSQL database using raw SQL. This includes querying, inserting, updating, and deleting records.
  • Interacting with a PostgreSQL database using the database/sql package provided by Go's standard library. Again, this includes querying, inserting, updating, and deleting records.
  • Using ORMs and other third party librarys to interact with SQL databases
Let's Learn Algorithms

This series is no longer being updated. Instead, check out the course I created based on it - Algorithms with Go

Algorithms are a core component in a computer science education, and when taught properly they can help a developer improve his or her skills massively. In this series we will work to both understand how common computer algorithms work, as well as how to properly code each of them in Go.

By coding each algorithm as we learn it, you will develop the skills necessary to translate a conceptual idea into correct and efficient code. While many developers will know how to solve a problem set before them, oftentimes bugs and issues can stem from minor mistakes that algorithm practice can help remedy.

In addition to coding each algorithm we will also discuss how it works as well as the efficiency of each algorithm. That is, we will discuss how fast or slow the code will be based on the size of the input. This is important because in many real world situations you can opt for simpler - but slower - code if you know your inputs won't be too large. Alternatively, you could determine that the simpler solution won't work for your inputs and know that you will need to spend some extra time on a more efficient algorithm.

If you are relatively new to programmer, or simply don't have a formal computer science education, I invite you to check out these articles. You won't be disappointed!

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Articles and Tutorials by
Jon Calhoun

Jon Calhoun is a full stack web developer who teaches about Go, web development, algorithms, and anything programming. If you haven't already, you should totally check out his Go courses.

Previously, Jon worked at several statups including co-founding EasyPost, a shipping API used by several fortune 500 companies. Prior to that Jon worked at Google, competed at world finals in programming competitions, and has been programming since he was a child.

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