---
id: 587d7fac367417b2b2512bdb
title: Set a Domain and a Range on a Scale
challengeType: 6
forumTopicId: 301491
dashedName: set-a-domain-and-a-range-on-a-scale
---
# --description--
By default, scales use the identity relationship. This means the input value maps to the output value. However, scales can be much more flexible and interesting.
Say a dataset has values ranging from 50 to 480. This is the input information for a scale, also known as the domain.
You want to map those points along the `x` axis on the SVG canvas, between 10 units and 500 units. This is the output information, also known as the range.
The `domain()` and `range()` methods set these values for the scale. Both methods take an array of at least two elements as an argument. Here's an example:
```js
// Set a domain
// The domain covers the set of input values
scale.domain([50, 480]);
// Set a range
// The range covers the set of output values
scale.range([10, 500]);
scale(50) // Returns 10
scale(480) // Returns 500
scale(325) // Returns 323.37
scale(750) // Returns 807.67
d3.scaleLinear()
```
Notice that the scale uses the linear relationship between the domain and range values to figure out what the output should be for a given number. The minimum value in the domain (50) maps to the minimum value (10) in the range.
# --instructions--
Create a scale and set its domain to `[250, 500]` and range to `[10, 150]`.
**Note**
You can chain the `domain()` and `range()` methods onto the `scale` variable.
# --hints--
Your code should use the `domain()` method.
```js
assert(code.match(/\.domain/g));
```
The `domain()` of the scale should be set to `[250, 500]`.
```js
assert(JSON.stringify(scale.domain()) == JSON.stringify([250, 500]));
```
Your code should use the `range()` method.
```js
assert(code.match(/\.range/g));
```
The `range()` of the scale should be set to `[10, 150]`.
```js
assert(JSON.stringify(scale.range()) == JSON.stringify([10, 150]));
```
The text in the `h2` should be -102.
```js
assert($('h2').text() == '-102');
```
# --seed--
## --seed-contents--
```html
```
# --solutions--
```html
```