---
id: cf1111c1c11feddfaeb9bdef
title: Generate Random Fractions with JavaScript
challengeType: 1
videoUrl: 'https://scrimba.com/c/cyWJJs3'
---
## Description
Random numbers are useful for creating random behavior.
JavaScript has a Math.random() function that generates a random decimal number between 0 (inclusive) and not quite up to 1 (exclusive). Thus Math.random() can return a 0 but never quite return a 1
Note
Like Storing Values with the Equal Operator, all function calls will be resolved before the return executes, so we can return the value of the Math.random() function.
## Instructions
Change randomFraction to return a random number instead of returning 0.
## Tests
```yml
tests:
- text: randomFraction should return a random number.
testString: assert(typeof randomFraction() === "number", 'randomFraction should return a random number.');
- text: The number returned by randomFraction should be a decimal.
testString: assert((randomFraction()+''). match(/\./g), 'The number returned by randomFraction should be a decimal.');
- text: You should be using Math.random to generate the random decimal number.
testString: assert(code.match(/Math\.random/g).length >= 0, 'You should be using Math.random to generate the random decimal number.');
```
## Challenge Seed
```js
function randomFraction() {
// Only change code below this line.
return 0;
// Only change code above this line.
}
```
### After Test
```js
(function(){return randomFraction();})();
```
## Solution
```js
function randomFraction() {
return Math.random();
}
```