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

---
id: 5cdafbe72913098997531682
title: Handle a Rejected Promise with catch
challengeType: 1
forumTopicId: 301204
dashedName: handle-a-rejected-promise-with-catch
---

# --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:

```js
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.

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

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

```js
assert(errorIsParameter);
```

You should log `error` to the console.

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

# --seed--

## --after-user-code--

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

## --seed-contents--

```js
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--

```js
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);
});
```