Go programming language

• Pavel Tišnovský, Red Hat
  • ptisnovs@redhat.com
• Presentation:
  • https://tisnik.github.io/presentations/summer_camp_2021/go.html
• Presentation source:
  • https://github.com/tisnik/presentations/blob/master/docs/summer_camp_2021/go.md

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Introduction

• Launched in November 2009 by Google
• Rob Pike, Ken Thompson, Robert Griesemer
• More readable replacement for C/C++/Java/…
• statically typed, compiled, garbage collected
• built-in concurrency
• server-side web (PHP, Node.js, Python)
• cloud technologies (docker, kubernetes)

Resources

• Go language course
• Tour of Go
• Effective Go
• Go Doc

Development interface

• Vim;-)
• Visual Studio Code + go lang support [[https://code.visualstudio.com/docs/setup/linux]]

Packages and Imports

• Program building blocks (“libraries”)
• Imported by other programs
• Package name is the last element of the import path
• Standard packages: [[https://golang.org/pkg/]]

package main

import "fmt"

Hello world

package main

import (
	"fmt"
)

func main() {
	fmt.Println("Hello world")
}

• Unicode support

package main

import (
	"fmt"
)

func main() {
	fmt.Println("Привет, мир")
}

go-fmt

package main; import "fmt"
func main(
) { fmt.Println("Hello world") }

package main

import "fmt"

func main() {
	fmt.Println("Hello world")
}

Syntax

• Evolved from C
• Declarations in postfix
• Exported symbols begin with Capital letter
• https://blog.golang.org/gos-declaration-syntax

int a;
int *p;
int *(*f)(int *);

a int
p *int
f func(*int) *int

Functions

Multiple return values

Named return values