Promises in JavaScript

 Code : 

// resolve

// reject

// pending

console.log("We are at tutorial 39b");

// Pretend that this response is coming from the server

const students=[

    {name:"Ram", subject:"JavaScript"},

    {name:"Rohan", subject:"Machine Learning"}

]

function enrollStudent(student){

    return new Promise(function(resolve, reject){

        setTimeout(function(){

            students.push(student);

            console.log("Student has been enrolled");

            const error=false;

            if(!error){

                resolve();

            }

            else{

                reject();

            }

        }, 5000);

    })

}

    

function getStudents(){

    setTimeout(function(){

        let str="";

        students.forEach(function(student){

            str+= `<li> ${student.name}</li>`

        });

        document.getElementById('students').innerHTML=str;

        console.log("Students have been fetched");

    }, 1000);

}

let newStudent={name:"Sunny", subject:"Python"}

enrollStudent(newStudent).then(getStudents).catch(function(){

    console.log("Some error occured");

});

// function inside then is ran as - resolve()

// function inside catch is ran as - reject ()

// Output: