In Go, a channel is a type of concurrent data structure that allows two or more goroutines (Go's term for lightweight threads) to communicate with each other. Channels provide a way for goroutines to send and receive values, and they are an essential part of Go's concurrency model.Here's a simple example that demonstrates how to use channels in Go:package mainimport ( "fmt")func main() { // Create a new channel with the `make` function ch := make(chan int) // Start a new goroutine that sends the value 5 to the channel go func() { ch <- 5 }() // Read the value fro...

If you were like me, a pure Java developer before writing Go, you must be wondering why Go doesn’t support the ternary operator like return a > 1 ? 0 : 1.Most mainstream languages like C and Java are supportive of ternary operators; languages like Python and Ruby support the simplified if-else one-liner, such as a = 0 if a > 1. However, Go is not among them. And it is not only about adding operators but also a concept of coding in a more convenient way, such as the ?: expression can be perfectly replaced by if-else, but what if you are required to duplicate it dozens or hundred tim...

Security vulnerabilities exist in any language and any code, some are written by ourselves, but more are from the upstream dependencies, even the underlying Linux. We have discussed the security protection methods for Go and Kubernetes Image in Path to a Perfect Go Dockerfile and Image Vulnerability Scanning for Optimal Kubernetes Security, in which the security scanning was performed based on generic.As the Go community grows, more and more open-source packages have caused more security vulnerabilities, which has raised the concern of Go officials, and then the security sc...

Go’s concise structure and powerful native library enable us to hit the ground running easily. It is more efficient than Java or Python when implementing the same functions, especially its concurrent programming, which is very handy and widely admired due to its goroutine and channel.goroutine and channel has much to dig into, and let’s start with channel, which I used to consider narrowly as a message queue to transfer data between goroutines and support data synchronization, but definitely owns a bigger stage.Channel == Semaphore + Buf...

Logging is indispensable in any code that we need its support both in debugging and in statistics. However, a package that filled withfmt.Println/fmt.Printf printing various messages can never be considered a read-to-be-adopted package, which can be optimized by a simple change, using Golang’s native log package to print information to standard output or to a file.Then, how to apply the log package? Are there any limitations? If so, can we seek open-source packages? Let’s find the answers together.Golang logpackage mainimport "log"func main() { log.Println("Log pri...

go.dev is a site where various resources for Go developers are shared, such as “Get Started”, Tutorial, Packages (pkg.go.dev), and all the official blogs. Among them, Packages is where I visit most, which allows free access to all the open-source Go packages submitted by communities including the native Golang packages. Thanks to all the contributors, I enjoy the great benefit, and sometimes I want to be a contributor myself.Let’s submit a “complete” package to pkg.go.dev today.Came pkg.go.dev into beingBefore pkg.go.dev’s birth...

When declaring variables in Go, we usually have two syntax options: In some scenarios, pointers; in others, reference; sometimes, either. It’s great to have choices, but it is also confusing sometimes as to which one in which scenario.To be more reasonable in choice-making, I started from pointers, walked through their natures, and summarized some rules in using them in Go.from unsplash, Jordan LadikosPointersGo has pointers. A pointer holds the memory address of a value.— from A Tour of GoThe data is stored in the memory when the program runs and each has a num...

In Build a Go KV Cache from Scratch in 20 minutes, I walked you through what matters when writing a local cache, and eventually implemented one, whose performance was beaten badly by that of the popular go-cache on Github though. However, the bright side is that we can learn a lot from those excellent Github Go cache products, studying their features, applicable scenarios, and implementations, and extracting what we need.In this article, I will mainly analyze and compare the four cache libraries of go-cache, bigcache, golang-lru, and groupcache, which are all...