Are you a Go black belt? What does mastery look like?

Are you a Go black belt? What does mastery look like?

John Arundel

Are you a grasshopper or a Go sensei? Can you wax on, wax off? Go mentor and would-be Mr Miyagi, John Arundel, explains how he grades his students using a system of coloured belts like those used in the martial arts. Find out how your skills compare to typical junior, mid-level, and senior devs!

map[string]interface{} in Go

map[string]interface{} in Go

John Arundel

What is a map[string]interface{} or map[string]any in Go, and why is it so useful? How do we deal with maps of string to interface{} in our programs? What the heck is an interface{}, anyway?

Iterating over a Golang map

Iterating over a Golang map

John Arundel

How do you iterate over Golang maps? How do you print a map? How do you write a for loop that executes for each key and value in a map? What is the iteration order of Go maps? Let's find out, in this practical, easy-to-follow tutorial.

Finding whether a Go map key exists

Finding whether a Go map key exists

John Arundel

What happens if you look up a key in a Go map that doesn’t exist? How do you check if a key is present in a map? How do you represent a set of objects as a map in Golang, and efficiently check whether a given value is in the set?

Storing and retrieving map values

Storing and retrieving map values

John Arundel

More about Golang maps: looking up keys, adding and updating values, and how to update the fields of a struct within a map. This mini-tutorial is part of a series on everything you need to know about maps in Go!

Map types in Golang

Map types in Golang

John Arundel

What map types exist in Go? What data types can we use as map keys? What about map values? Are different kinds of maps considered distinct types? And what’s the difference between nil and empty maps? Find out in this handy, bite-size tutorial on map types in Golang.

Go maps: declaring and initializing

Go maps: declaring and initializing

John Arundel

What is a Golang map? Why is it useful? How does it compare to a slice? How do you declare a map? How do you initialize a map in Go? Fear not, all these questions are answered in this friendly introduction to one of Go’s most powerful features.

Building a Golang Docker image

Building a Golang Docker image

John Arundel

Let's build a Docker container with Golang! It sounds complicated, but it really isn't. All you need are a few tools, a couple of simple commands, and ideally some cake. (The cake isn't strictly necessary, but coding is hungry work.)

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