# Is the Number a Repdigit

## A repdigit is a positive number composed out of the same digit. Create a function that takes an integer and returns whether it's a repdigit or not.

### Examples
```js
isRepdigit(66) ➞ true
isRepdigit(0) ➞ true
isRepdigit(-11) ➞ false
```

### Notes
- The number `0` should return `true` (even though it's not a positive number).