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---
id: 5d79253297c0ebb149ea9fed
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title: Part 1
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challengeType: 0
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dashedName: part-1
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---
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# --description--
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In functional programming, we prefer immutable values over mutable values.
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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.
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Start by creating an empty `infixToFunction` object using `const` .
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# --hints--
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See description above for instructions.
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```js
assert(code.replace(/\s/g, '').includes('constinfixToFunction={}'));
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```
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# --seed--
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## --before-user-code--
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```html
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< title > Spreadsheet< / title >
< style >
#container {
display: grid;
grid-template-columns: 50px repeat(10, 200px);
grid-template-rows: repeat(11, 30px);
}
.label {
background-color: lightgray;
text-align: center;
vertical-align: middle;
line-height: 30px;
}
< / style >
< / head >
< body >
< div id = "container" >
< div > < / div >
< / div >
```
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## --after-user-code--
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```html
< / body >
< / html >
```
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## --seed-contents--
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```html
< script >
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< / script >
```
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# --solutions--
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```html
< script >
const infixToFunction = {};
< / script >
```
