Black Friday Sale!

Save 50% on Web Development with Go and Test with Go until Dec 3.

Both courses have lifetime access, a 30-day money back guarantee, and free updates. This is also the biggest discount I offer on the courses, and I only do it once a year around Black Friday.

Thank you for your continued support and happy coding!

Jon Calhoun

Recent Articles

Querying for multiple records with Go's sql package

Learn how to query for multiple records using Go's database/sql package by querying for several users in a users table.

Show me your username and password requirements at login

This isn’t something I normally write about, but after the hundredth time creating an account with random password or username restrictions I am starting to lose my patience with companies. If you are going to require that my username or password have special characters, numbers, capital and lowercase letters, or anything else, show those requirements on the login page. No, hiding this information on the login page isn’t making your site more secure.

Querying for a single record using Go's database/sql package

In this article we cover how to query for a single record using Go's database/sql package, including handling the ErrNoRows error.

Updating and deleting PostgreSQL records using Go's sql package

Learn how to update and delete records with the database/sql package in Go. We also cover how to verify how many records were altered and return data from those rows.

How to shuffle arrays and slices in Go

If you are transitioning into Go from a language like Python or Ruby, at some point or another you are going to start missing one of the many helper functions offered by the language. The most recent example of this for me was when I wanted to shuffle a slice. In Ruby this is as simple as calling the shuffle method. array = [1, 2, 3, 4, 5] array.shuffle # shuffles the array!

How to determine if a JSON key has been set to null or not provided

Learn to distinguish between when a JSON key is set to null or the key wasn't provided at all when dealing with JSON in Go.

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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.

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

It's SQL Time

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!

Let's Learn Algorithms

Articles and Tutorials by

Jon Calhoun

Follow @joncalhoun

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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