GopherCon India: Evolution of a Gopher

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evolution of a gopher francesc

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about me - Developer Advocate for the Google Cloud Platform - Developer Programs Engineer for the Go team since 2012 - Lover of all programming languages - Instructor at Google @francesc github.com/campoy

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about this talk Inspired “evolution of a developer” by Raquel Velez (@rockbot)

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1. the newcomer the phases of evolution

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1. the newcomer 2. the explorer the phases of evolution

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1. the newcomer 2. the explorer 3. the builder the phases of evolution

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1. the newcomer 2. the explorer 3. the builder 4. the expert the phases of evolution

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the newcomer First steps: - tutorials - workshops Concepts: - syntax - slices and maps - functions, types, and methods

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create small programs, toy projects main resources: - go tour - go playground - documentation - golang-nuts/slack/irc playing around

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- write some small projects - still gets lost - many new things to learn - but knows where to find help and ask questions the explorer

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learning curve note: this is graphic is absolutely not scientific explorer

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Go is awesome, I can do everything! ”let me migrate this framework to Go” But to improve something we have to understand it first. the peak of inflated expectations

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inflated expectations lead to painful realizations

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But I miss X feature from Y language! Use the language as is and have fun. The standard library is very useful. the trough of disillusionment

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Try new things - go generate - Go on Android Fighting the disillusionment

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- parsing with go/ast - generation with text/template github.com/campoy/jsonenums jsonenums

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package painkiller //go:generate jsonenums -type=Pill type Pill int const ( Placebo Pill = iota Aspirin Ibuprofen Paracetamol Acetaminophen = Paracetamol )

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var _PillValueToName = map[Pill]string{ Placebo: “Placebo”, Aspirin: “Aspirin”, ... } func (r Pill) MarshalJSON() ([]byte, error) { s, ok := _PillValueToName[r] if !ok { return nil, fmt.Errorf("invalid Pill: %d", r) } return json.Marshal(s) }

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Challenges and competitions gophergala.com golang-challenge.com

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Solve a problem you care about New problems lead to new questions And sometimes new solutions the builder

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contribute to an existing project - Go - Docker - Kubernetes - Many other: github.com/golang/go/wiki/Projects

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tooling things that matter when you build stuff - go get/build/install/run - go generate - govet - go test -race - gofmt, goimports, goreturns

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Before goimports func main() { fmt.Println(“hello”) }

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After goimports package main import “fmt” func main() { fmt.Println(“hello”) }

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Before goreturns package foo func count() (int, error) { if err := check(); err != nil { return err } return n, nil }

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After goreturns package foo func count() (int, error) { if err := check(); err != nil { return 0, err } return n, nil }

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code reviews

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Intent: - fix mistakes - uniformize code style - improve quality of software - improve developers’ skill code reviews

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coding culture spreads via code reviews

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Learning and teaching opportunity code reviews

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the expert - specs - philosophy - recognition

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Go is “just” a tool As any other programming language - it can be very advanced - or hard to master but - it is the means to an end

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- Different points of view - Synergy between different languages - Idiomatic adaptation of idioms Why using just a tool?

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share your knowledge: - write - talk - complain the advocate

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go-meetups.appspot.com

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Gophers of every level of experience - top down - help gophers learn - bottom up - make the community more welcoming the advocate