* chore(learn): audit basic algorithm scripting * chore(learn): audit basic data structures * chore(learn): audit basic javascript * chore(learn): audit debugging * chore(learn): audit es6 * chore(learn): audit functional programming * chore(learn): audit intermidate algorithms * chore(learn): audit js projects * chore(learn): audit object oriented programming * chore(learn): audit regex * fix(learn): remove stray . * fix(learn): string to code * fix(learn): missed some * fix(learn): clarify strings Based on Randy's feedback, clarifies string instances where quotes were removed in favour of back ticks. * fix: apply suggestions - thanks Randy! :) Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * fix: non-suggestion comments * chore(learn): remove comments from codes Removes the comments from the description and instruction code blocks to ensure that all relevant information is translatable. * fix: Apply suggestions from code review Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * fix: revert crowdin fix * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.md Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * fix: Apply suggestions from code review Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-arrays.md Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * fix: Apply suggestions from code review Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * chore: change voice * fix: Christopher Nolan * fix: expressions would evaluate * fix: will -> would * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.md Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * fix: to work to push * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-for-loops.md Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.md Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
101 lines
2.0 KiB
Markdown
101 lines
2.0 KiB
Markdown
---
|
||
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 => {
|
||
|
||
});
|
||
```
|
||
|
||
`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);
|
||
});
|
||
```
|