jpuyy的网志

Category: Golang

  • godocc

    $ go install github.com/inancgumus/godocc

    $ which godocc

    /Users/jpuyy/go/bin/godocc

    # example

    $ godocc fmt printf
    package fmt // import “fmt”

    func Printf(format string, a …any) (n int, err error)
    Printf formats according to a format specifier and writes to standard
    output. It returns the number of bytes written and any write error
    encountered.

  • golang fmt

    https://pkg.go.dev/fmt

    # %g

    %g %e for large exponents, %f otherwise. Precision is discussed below.
    fmt.Printf(“%g feet is %g meters.\n”, feet, meters)

  • golang interface

    learn by doing

    Interface is a protocol – a contract – an abstract type

    It only describe the expected behavior

    naming convention: abstract description

    don’t use empty interface unless it’s necessary.

    type foo interface{}

    learn type switch:

    func format(v interface{}) string {
    switch v := v.(type) {
    case int:
    case string:
    default:
    }
    }

    When a type anonymously embeds a type, it can use the methods of the embedded type as its own

    Interfaces: group types by behavior

    Satisfy existing interfaces <- first thinking Interfaces are abstract bridges between types watch videos: https://www.udemy.com/course/learn-go-the-complete-bootcamp-course-golang

  • golang mod

    go mod init

    go mod tidy

  • Go GoLand 配置

    安装

    brew install go

    GOROOT 就是安装路径，不用管，会自动设置好

    GOPATH 为存放 go 项目和依赖的地方

    mkdir -p ~/go

    go 的子命令

    go env

    GoLand
    Editor/General/Appearance/Show whitespaces

    配置 File Watchers 进行 gofmt

  • golang 交叉编译

    编译 linux 64 位

    GOOS=linux GOARCH=amd64 go build

    编译 mac 64 位

    GOOS=darwin GOARCH=amd64 go build