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# 100 Go Mistakes and How to Avoid Them
# 📖 100 Go Mistakes and How to Avoid Them
Source code of 📖 [100 Go Mistakes and How to Avoid Them](https://www.manning.com/books/100-go-mistakes-and-how-to-avoid-them), edited by Manning.
Source code of [100 Go Mistakes and How to Avoid Them](https://www.manning.com/books/100-go-mistakes-and-how-to-avoid-them), edited by Manning (Oct. 2022).
![](cover.png)
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Designing functions to receive `io.Reader` types instead of filenames improves the reusability of a function and makes testing easier.
#### #47: Ignoring how defer arguments and receivers are evaluated (argument evaluation, pointer, and value receivers)
#### #47: Ignoring how `defer` arguments and receivers are evaluated (argument evaluation, pointer, and value receivers)
Passing a pointer to a `defer` function and wrapping a call inside a closure are two possible solutions to overcome the immediate evaluation of arguments and receivers.
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Ignoring an error, whether during a function call or in a `defer` function, should be done explicitly using the blank identifier. Otherwise, future readers may be confused about whether it was intentional or a miss.
#### #54: Not handling defer errors
#### #54: Not handling `defer` errors
In many cases, you shouldn’t ignore an error returned by a `defer` function. Either handle it directly or propagate it to the caller, depending on the context. If you want to ignore it, use the blank identifier.
@ -550,3 +550,9 @@ Teiva Harsanyi is a senior software engineer at Docker. He worked in various dom
> "Not having this will be the 101st mistake a Go programmer could make."
– Anupam Sengupta
## Resources
* How to make mistakes in Go (Go Time - episode #190)
* [Episode](https://changelog.com/gotime/190)
* [Spotify](https://open.spotify.com/episode/0K1DImrxHCy6E7zVY4AxMZ?si=akroInsPQ1mM5B5V2tHLUw&dl_branch=1)