Golang Series

Hello GoLang: This Article
GoLang (var and const) Variables and Constants: https://blog.yexca.net/archives/155
GoLang (func) Functions: https://blog.yexca.net/archives/156
GoLang (slice and map) Slices: https://blog.yexca.net/archives/160
GoLang (OOP) Object-Oriented Programming: https://blog.yexca.net/archives/162
GoLang (reflect) Reflection: https://blog.yexca.net/archives/204
GoLang (struct tag) Struct Tags: https://blog.yexca.net/archives/205
GoLang (goroutine) Goroutines: https://blog.yexca.net/archives/206
GoLang (channel) Channels: https://blog.yexca.net/archives/207

Go Download: https://go.dev/dl/

JetBrains GoLand: https://www.jetbrains.com/go/

Go Intro

Go compiles directly and can be deployed by just running it; it’s a static-typed language.

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# Run directly
go run hello.go

# Compile
go build hello.go
# Run after compilation
./hello

Some Go Applications

(1). Cloud Infrastructure

Key projects: Docker, Kubernetes, etcd, Consul, Cloudflare CDN, Qiniu Cloud Storage, etc.

(2). Core Backend Software

Key projects: TiDB, InfluxDB, CockroachDB, etc.

(3). Microservices

Key projects: go-kit, micro, Monzo Bank’s Typhon, Bilibili, etc.

(4). Internet Infrastructure

Key projects: Ethereum, Hyperledger, etc.

Hello Go

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package main // Define package name
/* 
 * You must specify which package the file belongs to on the first non-comment line of the source file.
 * 'main' indicates an independently executable program; every Go application includes a package named 'main'.
 */

import "fmt" // Import fmt package, which implements formatted I/O functions.

func main(){ // Function
    fmt.println("Hello Go")
}

Generally, the main function is the first function executed after startup; if an init function exists, it will execute first.

When defining a function, the { must be on the same line as the function name.