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100 Go Mistakes — And How to Avoid Them (Editorial)

Go (Golang) is designed to be simple, fast, and readable, but even experienced programmers fall into recurring mistakes that harm correctness, performance, readability, or maintainability. The following editorial highlights 100 common Go mistakes, grouped by theme, with concise explanations, examples of the bad pattern, and concrete fixes. Use this as a checklist when writing, reviewing, or refactoring Go code.

No graceful shutdown in servers — abrupt termination.
Fix: handle signals, use context.WithTimeout, drain connections. 100 Go Mistakes And How To Avoid Them Pdf Download

// ❌ Mistake #3: Closing HTTP response body incorrectly resp, _ := http.Get(url) defer resp.Body.Close() // may leak if resp is nil 100 Go Mistakes — And How to Avoid

Implementing methods with pointer receiver inconsistently.
Fix: choose pointer/value consistently depending on mutation/size. Not using defer for cleanup : The defer

Part 2: Concurrency

Concurrency is Go's strongest suit but also its biggest source of complex bugs.

  1. Not using defer for cleanup: The defer statement is used to schedule a function call to be executed when the surrounding function returns.