Golang Learning Notes (i): Introduction _golang

The main features of the Go language

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Automatic garbage collection
Richer built-in types
function multiple return value
Error handling
Anonymous functions and closures
Types and Interfaces
Concurrent programming
Reflection
Language interactivity

High performance/High efficiency development

Installation

Installation Instructions Address Http://golang.org/doc/install

Package Download Address Https://code.google.com/p/go/downloads/list

Confirm that the installation is successful

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Go version//view versions

environment variable Settings

Overall directory structure

With package organization, only the package name called main can contain the main function

A program has and has only one main package

Import other non main packages through the Import keyword

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bin/
|-Mathapp
pkg/
|-platform Name
|-XXX.A
src/
|-Mathapp
|-Main.go

Helloworld

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Package main//Declaration file Package

Import {
"FMT"//import package, cannot contain a package that is not used, otherwise the compilation error
}
Func Main () {//Entry function, no parameter no return value
Fmt. Println ("Hello World")
}

Run
$go Run Hello.go

$go Build Hello.go
$./hello

Go command

View with command line

Go Help

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Go build compilation
Go clean Removes the compiled build files from the current source package
Go FMT Format code
Go get dynamic Remote Code Pack
The go install generates the result file and compiles the results one to $gopath/pkg or $gopath/bin.
Go test Run the executable file for the test
Go Doc godoc-http=:8080 View document

Go fix repairs Previous versions of old code to new version
Go version View current versions
Go ENV view current GO's environment variables
Go list lists all currently installed package
Go run compile and run the Go Language program

Debugging

Using GDB for debugging, the go language is built inside

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List
Break
Delete
BackTrace
Info
Print
Whatis
Next
Continue
Set Variable

Editor settings

Vim

Other supplements
Comments

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Single
* *-----/multi-line

Import multiple Packages

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Import (
"FMT"
"OS"
)

Call the function in the package

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<packageName>.<Function>