Go 常用知识点及实例

目录

• 时间
• error
• 断言
• 定义函数类型
• 格式转换
• 打断点
• 休眠
• urlencode
• 去除首尾空格
• 字符串截取
• ip转number
• go test
• Go 随机数
• chan

https://www.cnblogs.com/followyou/p/12187949.html

error

https://www.cnblogs.com/followyou/p/12185514.html

断言

https://www.cnblogs.com/followyou/p/12185509.html

定义函数类型

type ExposureQualityService interface {

}

type NewExposureQualityServiceFunc func() ExposureQualityService

格式转换

https://www.cnblogs.com/followyou/p/12194128.html

打断点

fmt.Println(exposureData)
os.Exit(1)

休眠

func Sleep(d Duration)

const (
Nanosecond Duration = 1
Microsecond = 1000 * Nanosecond
Millisecond = 1000 * Microsecond
Second = 1000 * Millisecond
Minute = 60 * Second
Hour = 60 * Minute
)

urlencode

• 字符串

package main

import (
        "fmt"
        "net/url"
)

func main() {
        query := "Hellö Wörld@Golang"
        fmt.Println(url.QueryEscape(query))
}

• 多个参数

package main

import (
        "fmt"
        "net/url"
)

func main() {
        params := url.Values{}
        params.Add("name", "@Rajeev")
        params.Add("phone", "+919999999999")

        fmt.Println(params.Encode())
}

• 编码路径

package main

import (
        "fmt"
        "net/url"
)

func main() {
        path := "path with?reserved+characters"
        fmt.Println(url.PathEscape(path))
}

//  Output
// path%20with%3Freserved+characters

解码参考 https://www.urldecoder.io/golang/

去除首尾空格

package main

import (
        "fmt"
        "strings"
)

func main() {
        str := " hello world!  "
        str = strings.TrimSpace(str)
        fmt.Println(str)
}

字符串截取

str := "oeryoqpqpqepqw"
content = str[1:10]
fmt.println(content)

ip转number

func Ip2long(ip string) int64 {
        var cip net.IP
        cip = []byte(ip)
        // ipv4
        if cip.To4() != nil {
                num, _ := exnet.IP2Long(cip)
                return int64(num)
        } else {
                bigint := ipv6ToInt(ip)
                return bigint
        }
}

func ipv6ToInt(ip string) int64 {
        IPv6Int := big.NewInt(0)
        IPv6Int.SetBytes(net.ParseIP(ip).To4())
        return IPv6Int.Int64()
}

go test

显示单元测试详细信息且指定测试方法

 go test -v data-structure/heap/btree_heap.go data-structure/heap/btree_heap_test.go -test.run TestHeap_Replace

Go 随机数

s := rand.NewSource(time.Now().UnixNano())
token := rand.New(s).Intn(1000000)

chan

https://www.cnblogs.com/followyou/p/13799845.html