freeCodeCamp/curriculum/challenges/italian/15-javascript-algorithms-an.../learn-functional-programmin.../step-010.md

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---
id: 5d792533e7707b9645d7b540
title: Step 10
challengeType: 0
dashedName: step-10
---
# --description--
Remove the now redundant `addVar` definition.
# --hints--
See description above for instructions.
```js
assert(typeof addVar === 'undefined');
```
# --seed--
## --before-user-code--
```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>
```
## --after-user-code--
```html
</body>
</html>
```
## --seed-contents--
```html
<script>
--fcc-editable-region--
const addVar = (x, y) => x + y;
--fcc-editable-region--
const infixToFunction = {
"+": (x, y) => x + y
};
</script>
```
# --solutions--
```html
<script>
const infixToFunction = {
"+": (x, y) => x + y
};
</script>
```