var fs = require('fs');

var readFile = (path) => {

return new Promise( (resolve, reject) => {

fs.readFile(path, "utf8", (err, data)=> {

if(err) reject(err);

console.log("file read sucess");

resolve(data);

});

});

}

var writeFile = (data) => {

return new Promise((resolve, reject) => {

fs.writeFile(__dirname+"/writeMe.txt", data, (err)=> {

if(err) reject(err);

console.log("file created...")

resolve(__dirname+"/writeMe.txt");

});

})

}

var deleteFile = (path) => {

return new Promise((resolve, reject) => {

fs.unlink(path, (err) => {

if(err) reject(err);

resolve("File deleted successfully"); }

);

})

}

readFile(__dirname+"/read.txt")

.then((data)=> writeFile(data))

.then((path)=> deleteFile(path))

.then((result)=> console.log(result));