Efficient way to check IP in slice of IP addresses in Golang

Question

I\'m developing a network application in Golang. I have a slice of IP addresses. Each time a request comes I use net.LookupIP(host) to find out IP address of host w

Answer 1

You may use func (ip IP) Equal(x IP) bool from net package:

Equal reports whether ip and x are the same IP address. An IPv4 address and that same address in IPv6 form are considered to be equal.

Like this working sample:

package main

import (
    "fmt"
    "net"
)

func main() {
    ip := net.ParseIP("127.0.0.1")
    ips, err := net.LookupIP("localhost")
    if err != nil {
        panic(err)
    }
    for _, v := range ips {
        if v.Equal(ip) {
            fmt.Println(v)
        }
    }
}