Define the Promise

Promise.js

var promise = function(){
    return new Promise(function(resolve, reject) {
         resolve(promise2('promise 1 Complete'));
    });
}

var promise2 = function(value) {
    return new Promise(function(resolve, reject) {
         resolve(promise3('promise 2 Complete'));
    });
}

var promise3 = function(value2){
    return new Promise(function(resolve, reject) {
         resolve('promise 3 Complete');
    });
}

var Promise = promise().then(function(resolveVal) {
        return resolveVal;
    });
    
console.log(Promise);