---
id: 5d7925383f1b77db7f1ff59e
title: Step 100
challengeType: 0
dashedName: step-100
---
# --description--
This is (probably) false, so `random` is certainly impure.
The second property of pure functions is that they perform no side effects, which are state and I/O modifications. If you call a function without assigning the result to a variable, and it does something, then it's an impure function.
Call `window.onload()` in `update`.
# --hints--
See description above for instructions.
```js
assert(
/update=\(?event\)?=>\{.*window\.onload\(\).*\}/.test(code.replace(/\s/g, ''))
);
```
# --seed--
## --before-user-code--
```html
Spreadsheet
```
## --after-user-code--
```html
```
## --seed-contents--
```html
```
# --solutions--
```html
```