freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.english.md
Randell Dawson e9212c61d2 fix(curriculum): Remove unnecessary assert message argument from English challenges JavaScript Algorithms and Data Structures - 01 (#36401)
* fix: rm assert msg basic-javascript

* fix: removed more assert msg args

* fix: fixed verbiage

Co-Authored-By: Parth Parth <34807532+thecodingaviator@users.noreply.github.com>
2019-07-13 08:07:53 +01:00

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---
id: cf1111c1c11feddfaeb4bdef
title: Subtract One Number from Another with JavaScript
challengeType: 1
videoUrl: 'https://scrimba.com/c/cP3yQtk'
---
## Description
<section id='description'>
We can also subtract one number from another.
JavaScript uses the <code>-</code> symbol for subtraction.
<strong>Example</strong>
```js
myVar = 12 - 6; // assigned 6
```
</section>
## Instructions
<section id='instructions'>
Change the <code>0</code> so the difference is <code>12</code>.
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: Make the variable <code>difference</code> equal 12.
testString: assert(difference === 12);
- text: Only subtract one number from 45.
testString: assert(/var\s*difference\s*=\s*45\s*-\s*[0-9]*;(?!\s*[a-zA-Z0-9]+)/.test(code));
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
var difference = 45 - 0;
```
</div>
### After Test
<div id='js-teardown'>
```js
(function(z){return 'difference = '+z;})(difference);
```
</div>
</section>
## Solution
<section id='solution'>
```js
var difference = 45 - 33;
```
</section>