Promises and error handling

promise-errorhandling.js

'use strict';

function promiseThatThrows(){
  return new Promise((resolve,reject) => {
    throw new Error('!!This needs to be handled!!');
  });
}

function correctNestedErrorHandling(){
  return new Promise((resolve,reject) => {
    return promiseThatThrows()
      .catch((err) => {
        reject(err);
      });
  });
}

function hideError1(){
  return new Promise((resolve,reject) => {
    return promiseThatThrows();
  });
}

function hideError2(){
  return new Promise((resolve,reject) => {
    return promiseThatThrows()
      .catch((err) => {
        throw err;
      });
  });
}

hideError1()
  .catch((err) => {
    console.log('This is not caught!!',err);
  });

hideError2()
  .catch((err) => {
    console.log('This is not caught!!',err);
  });

correctNestedErrorHandling()
  .catch((err) => {
    console.log('Correctly handled error',err);
  });