Task 1: File - Read /Write API

    const fs = require('fs');

    function uploadUsers(){
        let users = [{id:1,name:"Naresh"},{id:2,name:"Suresh"}]
        fs.writeFile("users.json", JSON.stringify(users), function(err){
            if(err) throw err;
            console.log("File write completed");
        });
    }

    function getUsers(){
        fs.readFile("users.json", function(err,data){
            if(err) throw err;
            let users = JSON.parse(data);
            console.log("File read contents:", users);
        })
    }

    function getUsers(){
        fs.readFile("users.json", function(err,data){
            if(err) throw err;
            let users = JSON.parse(data);
            console.log("File read contents:", users);
        })
    }

    function getUser(){
        let userId = 1;
        fs.readFile("users.json", function(err,data){
            if(err) throw err;
            let users = JSON.parse(data);
            let user = users.find(obj=>obj.id == userId);
            console.log("File read contents:", user);
        })
    }

    function addUser(){

        fs.readFile("users.json", function(err,data){
            if(err) throw err;
            let users = JSON.parse(data);
            let newUser = {id:2, name:"Suresh"};
            users.push(newUser);
            fs.writeFile("users.json", JSON.stringify(users), function(error,resp){
                if(error) throw error;
                console.log("File updated");
            })
            
        })

    }

    function deleteUser(){

        let userId = 1;
        fs.readFile("users.json", function(err,data){
            if(err) throw err;
            let users = JSON.parse(data);
            let index = users.findIndex(obj=>obj.id==userId);
            if(index != -1){
                users.splice(index,1);            
                fs.writeFile("users.json", JSON.stringify(users), function(error,resp){
                    if(error) throw error;
                    console.log("File updated - removed record");
                })
            }
        })

    }

    uploadUsers();
    //getUsers();
    //getUser();
    //addUser();
    //deleteUser();