GPT-5 Chat vs Grok 4 Fast Non-Reasoning

# Challenge \#6: 🧤 Matching gloves 





EASY

In Santa's workshop, the elves have found **a mountain of magical gloves** in complete disarray.
Each glove is described by two values:

- `hand`: indicates whether it is a left (`L`) or right (`R`) glove
- `color`: the color of the glove (string)

Your task is to help them **match gloves**:
A valid pair is a left glove and a right glove **of the same color**.

You must return **a list with the colors of all the pairs found**.
Keep in mind that **there may be several pairs of the same color**.
The order is determined by whichever pair can be made first.

## 🧩 Examples

```javascript
const gloves = [\
  { hand: 'L', color: 'red' },\
  { hand: 'R', color: 'red' },\
  { hand: 'R', color: 'green' },\
  { hand: 'L', color: 'blue' },\
  { hand: 'L', color: 'green' }\
]

matchGloves(gloves)
// ["red", "green"]

const gloves2 = [\
  { hand: 'L', color: 'gold' },\
  { hand: 'R', color: 'gold' },\
  { hand: 'L', color: 'gold' },\
  { hand: 'L', color: 'gold' },\
  { hand: 'R', color: 'gold' }\
]

matchGloves(gloves2)
// ["gold", "gold"]

const gloves3 = [\
  { hand: 'L', color: 'red' },\
  { hand: 'R', color: 'green' },\
  { hand: 'L', color: 'blue' }\
]

matchGloves(gloves3)
// []

const gloves4 = [\
  { hand: 'L', color: 'green' },\
  { hand: 'L', color: 'red' },\
  { hand: 'R', color: 'red' },\
  { hand: 'R', color: 'green' }\
]

matchGloves(gloves4)
// ['red', 'green']
```