---
id: 5ddb965c65d27e1512d44d9e
title: Step 5
challengeType: 0
dashedName: step-5
---
# --description--
By default, `onsubmit` will pass the event object as a parameter to the function it calls. People usually call it `e`, short for event. Update the `calculate()` function to accept `e` as parameter.
Here is an example of an empty function called `square` that takes a `number` as a parameter:
```js
function square(number) {}
```
# --hints--
See description above for instructions.
```js
assert(calculate.toString().match(/function calculate\(\s*e\)\s*\{\s*\}/));
```
# --seed--
## --before-user-code--
```html