---
id: 5d79253352e33dd59ec2f6de
title: Part 8
challengeType: 0
isHidden: true
---
## Description
Add the key `+` to `infixToFunction` and assign it the value `addVar`.
## Instructions
## Tests
```yml
tests:
- text: See description above for instructions.
testString: assert(infixToFunction["+"].toString() === addVar.toString());
```
## Challenge Seed
```html
```
### Before Test
### After Test
```html
```
## Solution