LeetCode-in-Java
2727. Is Object Empty
Easy
Given an object or an array, return if it is empty.
- An empty object contains no key-value pairs.
- An empty array contains no elements.
You may assume the object or array is the output of JSON.parse.
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:
2 <= JSON.stringify(obj).length <= 105
Can you solve it in O(1) time?
Solution
function isEmpty(obj: Record<string, any> | any[]): boolean {
return Object.keys(obj).length === 0
}
export { isEmpty }