* 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>
		
			
				
	
	
		
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			101 lines
		
	
	
		
			2.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
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| id: 5cdafbe72913098997531682
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| title: Handle a Rejected Promise with catch
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| challengeType: 1
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| forumTopicId: 301204
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| dashedName: handle-a-rejected-promise-with-catch
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| ---
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| 
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| # --description--
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| 
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| `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:
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| 
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| ```js
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| myPromise.catch(error => {
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|   
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| });
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| ```
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| 
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| `error` is the argument passed in to the `reject` method.
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| 
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| # --instructions--
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| 
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| Add the `catch` method to your promise. Use `error` as the parameter of its callback function and log `error` to the console.
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| 
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| # --hints--
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| 
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| You should call the `catch` method on the promise.
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| 
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| ```js
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| assert(
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|   __helpers.removeWhiteSpace(code).match(/(makeServerRequest|\))\.catch\(/g)
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| );
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| ```
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| 
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| Your `catch` method should have a callback function with `error` as its parameter.
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| 
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| ```js
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| assert(errorIsParameter);
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| ```
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| 
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| You should log `error` to the console.
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| 
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| ```js
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| assert(
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|   errorIsParameter &&
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|     __helpers
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|       .removeWhiteSpace(code)
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|       .match(/\.catch\(.*?error.*?console.log\(error\).*?\)/)
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| );
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| ```
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| 
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| # --seed--
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| 
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| ## --after-user-code--
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| 
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| ```js
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| const errorIsParameter = /\.catch\((function\(error\){|error|\(error\)=>)/.test(__helpers.removeWhiteSpace(code));
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| ```
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| 
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| ## --seed-contents--
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| 
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| ```js
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| const makeServerRequest = new Promise((resolve, reject) => {
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|   // responseFromServer is set to false to represent an unsuccessful response from a server
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|   let responseFromServer = false;
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|     
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|   if(responseFromServer) {
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|     resolve("We got the data");
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|   } else {  
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|     reject("Data not received");
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|   }
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| });
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| 
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| makeServerRequest.then(result => {
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|   console.log(result);
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| });
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| ```
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| 
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| # --solutions--
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| 
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| ```js
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| const makeServerRequest = new Promise((resolve, reject) => {
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|   // responseFromServer is set to false to represent an unsuccessful response from a server
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|   let responseFromServer = false;
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|     
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|   if(responseFromServer) {
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|     resolve("We got the data");
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|   } else {  
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|     reject("Data not received");
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|   }
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| });
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| 
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| makeServerRequest.then(result => {
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|   console.log(result);
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| });
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| 
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| makeServerRequest.catch(error => {
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|   console.log(error);
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| });
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| ```
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