Promise.js

var promise = new Promise(function(resolve,reject){
		
    var total = sumNumbers(1,7);
    
    if(total > 5){
    		resolve(true);
    }
    else{
    		reject(false);
    }
});

promise.then(
	 value => console.log("result : " + value),
   error => console.log("Error  : " + error)
);

function sumNumbers(num1=0,num2=0){
	return num1+num2;
}