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2727. Is Object Empty
Description
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:
objis a valid JSON object or array2 <= JSON.stringify(obj).length <= 105
Can you solve it in O(1) time?
Solutions
-
function isEmpty(obj: Record<string, any> | any[]): boolean { for (const x in obj) { return false; } return true; } -
/** * @param {Object | Array} obj * @return {boolean} */ var isEmpty = function (obj) { for (const x in obj) { return false; } return true; };