freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/handle-a-rejected-promise-with-catch.md

id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
5cdafbe72913098997531682	Handle a Rejected Promise with catch	1	301204

--description--

catch is the method used when your promise has been rejected. It is executed immediately after a promise's reject method is called. Here’s the syntax:

myPromise.catch(error => {
  // do something with the error.
});

error is the argument passed in to the reject method.

--instructions--

Add the catch method to your promise. Use error as the parameter of its callback function and log error to the console.

--hints--

You should call the catch method on the promise.

assert(
  __helpers.removeWhiteSpace(code).match(/(makeServerRequest|\))\.catch\(/g)
);

Your catch method should have a callback function with error as its parameter.

assert(errorIsParameter);

You should log error to the console.

assert(
  errorIsParameter &&
    __helpers
      .removeWhiteSpace(code)
      .match(/\.catch\(.*?error.*?console.log\(error\).*?\)/)
);

--seed--

--after-user-code--

const errorIsParameter = /\.catch\((function\(error\){|error|\(error\)=>)/.test(__helpers.removeWhiteSpace(code));

--seed-contents--

const makeServerRequest = new Promise((resolve, reject) => {
  // responseFromServer is set to false to represent an unsuccessful response from a server
  let responseFromServer = false;
    
  if(responseFromServer) {
    resolve("We got the data");
  } else {  
    reject("Data not received");
  }
});

makeServerRequest.then(result => {
  console.log(result);
});

--solutions--

const makeServerRequest = new Promise((resolve, reject) => {
  // responseFromServer is set to false to represent an unsuccessful response from a server
  let responseFromServer = false;
    
  if(responseFromServer) {
    resolve("We got the data");
  } else {  
    reject("Data not received");
  }
});

makeServerRequest.then(result => {
  console.log(result);
});

makeServerRequest.catch(error => {
  console.log(error);
});