---
id: 5d7925364c106e9aaf05a16f
title: Step 77
challengeType: 0
dashedName: step-77
---
# --description--
`evalFormula` should return the value passed to it if this value remained unchanged. Otherwise, it should call itself with the latest value.
Use the ternary operator in the last line of `evalFormula` to return `functionExpanded` if `x === functionExpanded` and `evalFormula(functionExpanded)` otherwise.
# --hints--
See description above for instructions.
```js
assert(evalFormula('(2+2)*2') === '8');
```
# --seed--
## --before-user-code--
```html
Spreadsheet
```
## --after-user-code--
```html
```
## --seed-contents--
```html
```
# --solutions--
```html
```