This post will describe how to implement and use enumerations (or enum types) in Go. Enums are types that contain only a limited number of fixed values, as opposed to types like int or string which can have a wide range of values. This is useful for many situations: For example, when describing seasons in temperate climates, you’ll want to limit the options to certain possible values: Summer, Winter, Spring and Autumn....
In this post, we’ll discuss why we use mutexes in Go, and learn how to use a mutex to place a lock on data and fix race conditions. Go allows us to run code concurrently using goroutines. However, when concurrent processes access the same piece of data, it can lead to race conditions. Mutexes are data structures provided by the sync package. They can help us place a lock on different sections of data so that only one goroutine can access it at a time....
In this post we will learn how to create a Kafka producer and consumer in Go. We will also look at how to tune some configuration options to make our application production-ready. Kafka is an open-source event streaming platform, used for publishing and processing events at high-throughput. There are a lot of popular libraries for Go in order to interface with Kafka. For this post, we will be using the kafka-go library (but the same concepts will apply for any other library as well)....
This post will describe what the RSA algorithm does, and how we can implement it in Go. RSA (Rivest–Shamir–Adleman) encryption is one of the most widely used algorithms for secure data encryption. It is an asymmetric encryption algorithm, which is just another way to say “one-way”. In this case, it’s easy for anyone to encrypt a piece of data, but only possible for someone with the correct “key” to decrypt it....
Type assertions and type conversions seem to be a confusing topic in Go, since they both seem to do the same thing. In this article, we will see how assertions and conversions are actually quite different, and go under the hood to see what happens when you use each of them in Go. First, let’s see what they look like… This is a type assertion in Go: var greeting interface{} = "hello world" greetingStr := greeting....
This article explains what SQL database transactions are, and how to implement them in Go (Golang). Transactions are very useful when you want to perform multiple operations on a database, but still treat them as a single unit. We will go into detail on why this is useful, and how you can use it in your Go applications. To illustrate our examples, we will use Postgres as our database of choice....
This tutorial will go through a straightforward set of steps to get a responsive telegram bot up and running from scratch in Golang I spent a considerable amount of time figuring out how to make a functional telegram bot. I mean sure, the official introduction is good, but theres a lot of stuff about what bots are, and a few scattered instructions about the API, but not enough of structure for a beginner to get up and running quickly....
This post talks about what functional options are in Go, and how we can use the options pattern to implement them. Functional options take the form of extra arguments to a function, that extend or modify its behavior. Here’s an example which uses functional options to create a new House struct: h := NewHouse( WithConcrete(), WithoutFireplace(), ) Here, NewHouse is a constructor function. WithConcrete and WithFireplace are options passed to the constructor to modify it’s return value....
This article will explain the command pattern, where to use it, and how to implement it in Go. The command pattern, as the name suggests, is used when we want to create and execute “commands”. Different commands have their own implementation, but have the same steps for execution. The Command Interface The basic unit for implementing the command pattern is the Command interface: type Command interface { execute() } If the command can error out, the interface can contain an error return value as well:...
At first, it’s easy to see arrays and slices as the same thing: a data structure to represent collections. However, they are actually quite different from one another. In this post we will explore their differences and implementation in Go. We will then look at some examples so that you can make a more informed decision on when to use them. Arrays An array is a fixed collection of data. The emphasis here is on fixed, because once you set the length of an array, it cannot be changed....
