File Handling using methods

[deadlegend (Anonymous)]

How to read/write in form of maps in the files in Golang.For ex:- if f is an object of type file struct then if i need to implement f.write(“key”,“value”) in the file such that fmt.Println(f.read(“key”)) should yield value?

[lutzhorn]

There is no type in the standard library that does this. But you can use a simple library like github.com/magiconair/properties.

package main

import (
	"fmt"
	"io/ioutil"
	"log"

	// https://pkg.go.dev/github.com/magiconair/properties?
	"github.com/magiconair/properties"
)

func main() {
	// Declare a properties instance and put some values into it.
	p := properties.NewProperties()
	p.Set("key1", "value1")
	p.Set("key2", "value2")

	// Open a temporary file.
	tmpfile, err := ioutil.TempFile("", "*.properties")
	if err != nil {
		log.Panic(err)
	}

	// Remember the filename.
	fn := tmpfile.Name()

	// Write the properties to the file.
	_, err = p.Write(tmpfile, properties.UTF8)
	if err != nil {
		log.Panic(err)
	}

	err = tmpfile.Close()
	if err != nil {
		log.Panic(err)
	}

	// Now read the properties back in.
	q := properties.MustLoadFile(fn, properties.UTF8)

	// And print the value for one of the used keys.
	v, ok := q.Get("key1")
	if ok {
		fmt.Println(v)
	} else {
		fmt.Println("key1 missing")
	}
}

[lutzhorn]

Well, you should have included this in your first post. This looks like an exercise. What have you tried to solve it? Does it work?

BTW: Please indent code using the </> button at the top of the edit field. Right now it is very hard to read.