--- id: 5d7925357a0533eb221b005d title: Part 044 challengeType: 0 isBeta: true --- ## Description
Replace the call to `arr` in `arr.concat([end])` with `[start]` and remove the `arr` variable and its definition.
## Instructions
## Tests
```yml tests: - text: See description above for instructions. testString: assert(!(code.includes("arr")) && code.replace(/\s/g, "").includes("[start].concat([end])")); ```
## Challenge Seed
```html ```
### Before Test
```html Spreadsheet
```
### After Test
```html ```
## Solution
```html ```