Dont forget to share your feedback about developing with Go ✍️

https://go.dev/blog/survey2024-h2

go.dev

Share your feedback about developing with Go - The Go Programming Language

Help shape the future of Go by sharing your thoughts via the Go Developer Survey

Providing context to cancellations in Go 1.20 with the new context WithCause API

https://josephwoodward.co.uk/2023/01/context-cancellation-cause-with-cancel-cause

and proposal https://github.com/golang/go/issues/51365

Joseph Woodward's Blog

Providing context to cancellations in Go 1.20 with the new context WithCause API

Some pitfalls about generating Kubernetes Custom Resources with controller\-gen over the years, and how to do more rigid validation and defaulting with it:

https://ahmet.im/blog/crd-generation-pitfalls/

Ahmet Alp Balkan

Kubernetes CRD generation pitfalls

A quick code search query reveals at least 7,000 Kubernetes Custom Resource Definitions in the open source corpus,1 most of which are likely generated with controller-gen —a tool that turns Go structs with comments-based markers into Kubernetes CRD...

Old but still worth to read about why one shouldn;t defer Close() on writable files:

https://www.joeshaw.org/dont-defer-close-on-writable-files/

www.joeshaw.org

Don't defer Close() on writable files

It'll bite you some day

How do you track code coverage for OSS projects?

codecov seems very flaky, (will provide some details in thread)

wdyt about https://github.com/vladopajic/go-test-coverage?tab=readme-ov-file

GitHub

GitHub - vladopajic/go-test-coverage: go-test-coverage is tool and github action which reports issues when test coverage is below…

go-test-coverage is tool and github action which reports issues when test coverage is below set threshold - GitHub - vladopajic/go-test-coverage: go-test-coverage is tool and github action which r...

TIL: a % 128 = 0 is the same as a & 127 = 0

'Which is a faster operation since it just requires doing the AND and not the whole division and remainder comparison' @jesusvazquezp

from https://github.com/prometheus/prometheus/pull/14118#pullrequestreview-2068077407

GitHub

Check context every 128 labels instead of 100 by colega · Pull Request #14118 · prometheus/prometheus

Follow up on #14096 As promised, I bring a benchmark, which shows a very small improvement if context is checked every 128 iterations of label instead of every 100. It's much easier for a compu...

proposal: reflect: add TypeAssert likely accepted ? ')

https://github.com/golang/go/issues/62121

GitHub

proposal: reflect: add TypeAssert · Issue #62121 · golang/go

Consider the following benchmark: func Benchmark(b *testing.B) { v := reflect.ValueOf(new(time.Time)).Elem() b.ReportAllocs() for i := 0; i < b.N; i++ { \_ = v.Interface().(time.Time) } } This cu...

Collections what's new in Go 1.22:

- slices.Concat https://blog.carlana.net/post/2024/golang-slices-concat/
- reflect.TypeFor https://blog.carlana.net/post/2024/golang-reflect-type-for/
- https://pkg.go.dev/cmp#Or
- https://pkg.go.dev/net/http@master#FileServerFS
- https://pkg.go.dev/database/sql#Null