79 lines
1.7 KiB
Markdown
79 lines
1.7 KiB
Markdown
---
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id: 587d7b85367417b2b2512b39
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title: Catch Missing Open and Closing Parenthesis After a Function Call
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challengeType: 1
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forumTopicId: 301185
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---
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## Description
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<section id='description'>
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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.
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The variables in the following example are different:
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```js
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function myFunction() {
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return "You rock!";
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}
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let varOne = myFunction; // set to equal a function
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let varTwo = myFunction(); // set to equal the string "You rock!"
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```
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</section>
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## Instructions
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<section id='instructions'>
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Fix the code so the variable <code>result</code> is set to the value returned from calling the function <code>getNine</code>.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: Your code should fix the variable <code>result</code> so it is set to the number that the function <code>getNine</code> returns.
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testString: assert(result == 9);
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- text: Your code should call the <code>getNine</code> function.
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testString: assert(code.match(/getNine\(\)/g).length == 2);
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function getNine() {
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let x = 6;
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let y = 3;
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return x + y;
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}
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let result = getNine;
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console.log(result);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function getNine() {
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let x = 6;
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let y = 3;
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return x + y;
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}
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let result = getNine();
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console.log(result);
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```
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</section>
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