Go init() - An initial introduction to the language!

Part of workshop in Developer Circle Casablanca

Go is #1 programming language developers want to learn this year (*hackerrank) 😎, for those of you who share this urge, we have you backed with a special event, where you will get some solid knowledge to help you start with this fabulous PL, from the

Transcript

1. #devc #golang #goinit Go init() An initial introduction to the language Some techs developed using Go:
2. Mohamed Ez-zarghili Chief Everything Officer https://xor.ma Training Projects management VPS hosting Gitlab CE hosting Events Management ... AIDC $ whoami | echo "@$(xargs)" → @ezzarghili
3. Just yet another programming language? Who & Why ?
4. • Hotspot compiler • Art of Simplicity • Active in Go repo Who? @ezzarghili
5. @ezzarghili “Everyone you will ever meet will know something you don’t.” - Bill Nye • Procedural vs OOP vs FP vs CSP • Compiled vs interpreted • Static vs dynamic typing Learn Why?
6. @ezzarghili “I not only use all the brains that I have, but all that I can borrow.” - Woodrow Wilson • Syntax • CSP concepts • Duck typing • Tooling concepts Borrow Why?
7. @ezzarghili “The ability to simplify means to eliminate the unnecessary so that the necessary may speak.” - Hans Hofmann • No overloading • No type hierarchy • No exceptions • Wait for generics Drop Why?
8. Why? @ezzarghili “If I seen further it is by standing on the shoulders of giants.” - Issac Newton • Ultrafast Compilation • Errors are values • Composition/strong duck typing • stdlib a.k.a included batteries • Integrated tools • Compatibility promise • Lightweight CSP Concurrency with goroutines Improve
9. Basic types, identifiers, keywords and Hello World! Hello Gopher!
10. Basic Types @ezzarghili bool string complex64 complex128 int int8 uint8 … uint64 uintptr rune byte
11. Identifiers & Keywords @ezzarghili Identifiers Unicode Standard 8.0 letters and digits No composed characters MixedCace mixedCace 25 keywords
12. Hello World! @ezzarghili package main func main() { println("Hello Gopher!") }
13. What are the main programming paradigms used in Go? Programming Paradigms
14. Imperative / Procedural @ezzarghili I don’t even have the guts to explain this Or do I? :)
15. Object-based @ezzarghili Duck typing → “if it quacks like a duck it’s a duck” duck test Everything is interface{} “interface{} says nothing*” Type Composition → Oriented Object’s like capabilities * Rob Pike’s https://go-proverbs.github.io/
16. Functional @ezzarghili Higher order functions → Use wherever you can use expressions + Currying and Partial Functions Eager vs Lazy Evaluation → Eager Evaluation, goroutine and channels to emulate laziness Tail-call optimization → No, For performance reasons
17. Concurrent @ezzarghili Concurrency ≠ Parallelism Core #1 Core #2 Core #1 Work Groups “sync” Select Statement goroutine channel Mutex CSP
18. Don’t look elsewhere! Start here. Standard library
19. Commonly used @ezzarghili time crypto/rsa... database/sql encoding/json... fmt strconv html/template net/http sync flags
20. Testing and Benchmarking! Testing
21. Testing @ezzarghili Test Helpers Benchmarking Mocks
22. Great tools with no extra work fmt, vet, race, doc... Tooling
23. Good practices and tips Good Practice
24. Don’t look at the abyss @ezzarghili “Timeout for Http client calls”
25. No else @ezzarghili “Prefer return, over else”
26. Interfaces vs Concrete @ezzarghili “Return implementations, accept interfaces”
27. Scratch for docker @ezzarghili “To get a slim docker image base off scratch, if using Client over https/tls ca-certificates are required”
28. ... Thank you $ whoami | echo "@$(xargs)" → @ezzarghili