---
id: 5d792533a5c42fb4d1a4b70d
title: Part 14
challengeType: 0
isHidden: true
---
## Description
Replace the second argument of `str.replace` with an anonymous function, which takes `match`, `arg1`, `fn`, and `arg2`, and returns `infixToFunction["+"]`.
## Instructions
## Tests
```yml
tests:
- text: See description above for instructions.
testString: assert(code.replace(/\s/g, "").includes('str.replace(regex,(match,arg1,fn,arg2)=>infixToFunction["+"])'));
```
## Challenge Seed
```html
```
### Before Test
### After Test
```html
```
## Solution