kikstart journey of Golang with Hello world - Gopherlabs
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This document summarizes key concepts in Go programming including packages, functions, parameters vs arguments, and more. It discusses how every Go file begins with a package name, and the "main" package is the entry point for a program. Functions need to be capitalized to be accessible outside a package. It also provides review questions and references for further reading on Go.
kikstart journey of Golang with Hello world - Gopherlabs
- 1. An Ultimate GopherLabs Hands-on Labs
- 2. • Docker Community Leader , Bangalore • Author :- lightweight Kubernetes with k3s with packt Publication • Gopherlabs – 200+ tutorials • Okteto – Kubernetes For Developer , Bangalore Meetup Organizer Who Am I? @BiradarSangam Sangam Biradar EngineITops.com
- 3. Every go file begins with a package name. The name of the package must be the same as the folder name except for package main. Package main is the entry point for your program. The “fmt” package is being imported. If you are using code from other packages, you list the packages that you want to import. This allows you to use code in your program that other people have written. Packages are also sometimes referred to as libraries. A parameter is the variable which is part of the func’s signature (func declaration). An argument is an expression used when calling the func. source: modified from stackoverflow
- 4. This function is declared with no (choose one): ● parameters ● arguments “Hello world” is an example of a literal (choose one): ● parameter ● argument https://play.golang.org/p/-N_yGtploWl
- 5. The func main() is the entry point for your program; the first code that will run. The package main can also have other functions besides func main(). An expression specifies the computation of a value by applying operators and functions to operands. source: effective go Code from the “fmt” package is being used. Println is a function declared in the “fmt” package. For a function to be accessible to other packages, it must be Capitalized. This is analogous to “public” in other languages. The “fmt” package is being imported. Every go file begins with a package name. The name of the package must be the same as the folder name except for the main package. The main package is the entry point for your program. If you are using code from other packages, you list the packages that you want to import. This allows you to use code in your program that other people have written. Packages are also sometimes referred to as libraries. https://play.golang.org/p/-N_yGtploWl
- 6. ● go build and go run ● go build main.go ● go run main.go
- 9. ● Review Questions ● What is the purpose of package main in a go program? ● What function must package main contain? ● Can package main contain a function called func blueSky() ? ● What makes a func accessible outside a package?
- 10. ● Review Questions ● Parameters vs Arguments - What is the difference between the two? ● Expressions vs Statements- What is the difference between the two? ● Variable, Constant, Literal – - Define the three concepts above. - Give an example of a literal from the “hello world” example.
- 11. ● Review Questions ● Build “hello go” in your editor ● Use go run from the command line to make your “hello go” program execute ● Go build does what when run on a folder containing package main? ● Go build does what when run on a folder containing a library package?
- 12. ● Go Install ● Go install does what when run on a folder containing package main? ● Go install does what when run on a folder containing a library package?
- 13. ● References ● https://gopherlabs.collabnix.com ● https://godoc.org/ ● https://golang.org/doc/ ● https://collabnix.github.io/gopherlabs/Beginner s/hello-world.html