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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>
```
