Javascript Promises

gistfile1.txt

let example = new Promise(
  function(resolve, reject){
     let success =  do some async task;
     if(success){
       resolve();
     }else{
       reject();
     }
  };
);

example.then(
  success => //do something with success value, //note: this is the function passed for resolve()
  error => //do something with error            //note: this is the function passed for reject()
);