Hey Dev.to community! ?
If you've ever worked with range loops in Golang, you might have encountered some subtle yet frustrating bugs. These often arise from how elements are referenced within the loop. As Go developers, understanding this behaviour is crucial for writing clean, bug-free code.
In my latest article, I dive into:
Here’s a sneak peek at one common issue:
func getAvatarUrl(characterId int) string{ // Simulate getting URL return fmt.Sprintf("https://base-url/%d", characterId) } type CharacterInfo struct { id int characterName string avatarUrl string } charactersOfGOT := []CharacterInfo{ {id: 1, characterName: "Jon Snow"}, {id: 2, characterName: "Daenerys Targaryen"}, {id: 3, characterName: "Arya Stark"}, {id: 4, characterName: "Tyrion Lannister"}, } for _, charInfo := range charactersOfGOT { charInfo.avatarUrl = getAvatarUrl(charInfo.id) } for _, charInfo := range charactersOfGOT { fmt.Printf("Id: %d Name: %s, avatar: %s\n", charInfo.id, charInfo.characterName, charInfo.avatarUrl) }
Why doesn’t this output what you expect? ? If you've faced a similar challenge, this article will help you understand why!
? Read the full article here to learn how to avoid these traps and become a pro at handling range loops in Go.
I'd love to hear your thoughts and experiences with Go's range loops. Have you run into any weird behaviour, or do you have tips to share? Let’s discuss this in the comments! ?
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