---
id: 5d792536504e68254fe02236
title: Part 64
challengeType: 0
---
# --description--
The technique we just used is called currying - instead of taking multiple arguments, a function takes a single argument and return another function, which also takes a single argument.
Define a new curried function, `addChars`, and set it equal to `c1 => c2 => c1 + c2`.
# --hints--
See description above for instructions.
```js
assert(code.replace(/\s/g, '').includes('constaddChars=c1=>c2=>c1+c2'));
```
# --seed--
## --before-user-code--
```html
Spreadsheet
```
## --after-user-code--
```html
```
## --seed-contents--
```html
```
# --solutions--
```html
```