Promise example

promise.js

var p1 = new Promise(function (resolve) {
   
   return resolve(10); 
});

var add = function (num) {

    return new Promise(function (resolve) {

        return resolve(10 + num); 
    });    
};

p1
.then(function (result) {

    console.log("First result", result);
    return result;
})
.then(function (prevResult) {
    
    console.log("Prev", prevResult);
    return add(prevResult);
})
.then(function (final) {
    
    console.log("Final result", final);
    // Awesome throw error
    throw Error("I Am awesome");
});