---
id: 5d79253297c0ebb149ea9fed
title: Part 1
challengeType: 0
dashedName: part-1
---
# --description--
In functional programming, we prefer immutable values over mutable values.
Mutable values (declared with `var` or `let`) can lead to unexpected behaviors and bugs. Values declared with `const` cannot be reassigned, which makes using them easier because you don't have to keep track of their values.
Start by creating an empty `infixToFunction` object using `const`.
# --hints--
See description above for instructions.
```js
assert(code.replace(/\s/g, '').includes('constinfixToFunction={}'));
```
# --seed--
## --before-user-code--
```html
Spreadsheet
```
## --after-user-code--
```html
```
## --seed-contents--
```html
```
# --solutions--
```html
```