Given an object or an array, return if it is empty.
You may assume the object or array is the output of JSON.parse.
Examples
Example 1
Input: obj = {"x": 5, "y": 42}
Output: false
Explanation: The object has 2 key-value pairs so it is not empty.
Example 2
Input: obj = {}
Output: true
Explanation: The object doesn't have any key-value pairs so it is empty.
Example 3
Input: obj = [null, false, 0]
Output: false
Explanation: The array has 3 elements so it is not empty.
Constraints
obj is a valid JSON object or array2 <= JSON.stringify(obj).length <= 105