100 Go Mistakes And How To Avoid Them Pdf Download May 2026

If you cannot read the whole book immediately, use this cheat sheet to check your current Go code:

By internalizing these mistakes, you will move from "writing Go code that compiles" to "writing Go code that is robust and performant."

As of my last update, here are a few points to consider:

If you're looking for a free PDF version, you might find it through: 100 Go Mistakes And How To Avoid Them Pdf Download

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While not a PDF download, the author has given keynote talks summarizing the book. Search for "100 Go Mistakes Teiva Harsanyi slides" on GitHub or SpeakerDeck. These are free and cover 60% of the book's core concepts.

Unlike standard tutorials that focus on syntax, 100 Go Mistakes focuses on context. It doesn't just tell you what the nil pointer is; it shows you the 10 unique ways nil breaks your production code.

The book is structured into specific buckets of Go knowledge: If you cannot read the whole book immediately,

// ❌ Mistake #1: Loop variable capture
for i := 0; i < 3; i++ 
    go func()  fmt.Println(i) () // prints 3,3,3
// ✅ Fix: Pass as argument
for i := 0; i < 3; i++ 
go func(i int)  fmt.Println(i) (i)

// ❌ Mistake #2: Nil interface check
var p *int = nil
var i interface{} = p
fmt.Println(i == nil) // false!
// ✅ Fix: Check underlying type/value
fmt.Println(p == nil) // true
// ❌ Mistake #3: Closing HTTP response body incorrectly
resp, _ := http.Get(url)
defer resp.Body.Close() // may leak if resp is nil By internalizing these mistakes, you will move from
// ✅ Fix: Check nil first
if resp != nil 
defer resp.Body.Close()

Based on the principles of Teiva Harsanyi’s renowned book "100 Go Mistakes and How to Avoid Them", this PDF-style guide compiles the most critical errors across: