Promise Error Handler

index.js

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

function b(){
  return a().then(function () {
    return Promise.resolve("11");
  })
  .then(function(data){
    throw new Error('b code error');
    return data;
  })
  .catch(function(err){
    console.log(err.message);
    console.log("error capturado en b");
    //return Promise.reject(err);
  });
}

b().then(function(data){
  console.log("Hola");
  console.log(data);
  throw new Error('main code error');
}).catch(function(err){
  console.log(err.message);
  console.log("error capturado en main");
})