**Tell us what’s happening:**

**Your code so far**

```
const sum = (...args) => {
return args.reduce((a, b) => a + b, 0);
}
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36`

.

**Challenge:** Use the Rest Parameter with Function Parameters

**Link to the challenge:**

My question is why did we use 0 in the arrow function ??

```
return args.reduce((a, b) => a + b, 0);
```