05f73ca409
* fix: convert js algorithms and data structures * fix: revert some blocks back to blockquote * fix: reverted comparison code block to blockquotes * fix: change js to json Co-Authored-By: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> * fix: convert various section to triple backticks * fix: Make the formatting consistent for comparisons
77 lines
1.9 KiB
Markdown
77 lines
1.9 KiB
Markdown
---
|
|
id: 587d7b85367417b2b2512b39
|
|
title: Catch Missing Open and Closing Parenthesis After a Function Call
|
|
challengeType: 1
|
|
---
|
|
|
|
## Description
|
|
<section id='description'>
|
|
When a function or method doesn't take any arguments, you may forget to include the (empty) opening and closing parentheses when calling it. Often times the result of a function call is saved in a variable for other use in your code. This error can be detected by logging variable values (or their types) to the console and seeing that one is set to a function reference, instead of the expected value the function returns.
|
|
The variables in the following example are different:
|
|
|
|
```js
|
|
function myFunction() {
|
|
return "You rock!";
|
|
}
|
|
let varOne = myFunction; // set to equal a function
|
|
let varTwo = myFunction(); // set to equal the string "You rock!"
|
|
```
|
|
|
|
</section>
|
|
|
|
## Instructions
|
|
<section id='instructions'>
|
|
Fix the code so the variable <code>result</code> is set to the value returned from calling the function <code>getNine</code>.
|
|
</section>
|
|
|
|
## Tests
|
|
<section id='tests'>
|
|
|
|
```yml
|
|
tests:
|
|
- text: Your code should fix the variable <code>result</code> so it is set to the number that the function <code>getNine</code> returns.
|
|
testString: assert(result == 9, 'Your code should fix the variable <code>result</code> so it is set to the number that the function <code>getNine</code> returns.');
|
|
- text: Your code should call the <code>getNine</code> function.
|
|
testString: assert(code.match(/getNine\(\)/g).length == 2, 'Your code should call the <code>getNine</code> function.');
|
|
|
|
```
|
|
|
|
</section>
|
|
|
|
## Challenge Seed
|
|
<section id='challengeSeed'>
|
|
|
|
<div id='js-seed'>
|
|
|
|
```js
|
|
function getNine() {
|
|
let x = 6;
|
|
let y = 3;
|
|
return x + y;
|
|
}
|
|
|
|
let result = getNine;
|
|
console.log(result);
|
|
```
|
|
|
|
</div>
|
|
|
|
|
|
|
|
</section>
|
|
|
|
## Solution
|
|
<section id='solution'>
|
|
|
|
```js
|
|
function getNine() {
|
|
let x = 6;
|
|
let y = 3;
|
|
return x + y;
|
|
}
|
|
|
|
let result = getNine();
|
|
console.log(result);
|
|
```
|
|
</section>
|