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# Challenge \#17: 🎄 The Christmas lights panel 





EASY

At the North Pole, they’ve set up a **panel of Christmas lights** 🎄✨ to decorate the workshop. Each light can be on with a color, or off.

The panel is represented as a **matrix** where each cell can be:

- `'.'` → light off
- `'R'` → red light
- `'G'` → green light

The elves want to know if there is a **line of 4 lights of the same color** that are on and **aligned** on the panel (only horizontal ↔ or vertical ↕). Lights that are off (`'.'`) don’t count.

```javascript
hasFourLights([\
  ['.', '.', '.', '.', '.'],\
  ['R', 'R', 'R', 'R', '.'],\
  ['G', 'G', '.', '.', '.']\
])
// true → there are 4 red lights horizontally

hasFourLights([\
  ['.', 'G', '.', '.'],\
  ['.', 'G', '.', '.'],\
  ['.', 'G', '.', '.'],\
  ['.', 'G', '.', '.']\
])
// true → there are 4 green lights vertically

hasFourLights([\
  ['R', 'G', 'R'],\
  ['G', 'R', 'G'],\
  ['G', 'R', 'G']\
])
// false → there are no 4 lights of the same color in a row
```

**Note:** The board can be any size. No diagonals.