64 lines
1.3 KiB
Markdown
64 lines
1.3 KiB
Markdown
# go (golang) cheatsheet
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## external
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* awesome-go list of tools: [avelino/awesome-go](https://github.com/avelino/awesome-go)
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## tools and environment
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goimports manages your import lines and should be used instead of fmt, golangci-lint will tell you when you're doing silly things, and gotest will do the same thing as `go test` but with color output in terminal.
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```
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go get golang.org/x/tools/cmd/goimports
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go get github.com/golangci/golangci-lint/cmd/golangci-lint@v1.31.0
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go get -u github.com/rakyll/gotest
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```
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## code style
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* obviously, always gofmt
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* run golangci-lint
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## types and interfaces
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Accept and provide `String() string` method and the associated `fmt.Stringer` interface.
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Accept and provide `GoString() string` method so `%#v` (see below) works right.
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## testing
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### use testify
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```
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import "github.com/stretchr/testify/assert"
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func TestSomething(t *testing.T) {
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a := assert.New(t)
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thing, err := functionCall()
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t.Logf("%#v", thing)
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a.NotNil(err)
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}
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```
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### use %#v
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``` go
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t.Logf("%#v", eim)
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```
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Outputs types with keys, viz:
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```
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inner_test.go:17: &message.InnerMessage{
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ours:(*message.InnerJSONStruct)(nil),
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dstPubKey:(*cbk.CryptoBoxKey)(nil),
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srcPrivKey:(*cbk.CryptoBoxKey)(nil)}
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```
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