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Check if Object is Empty

Certification: Basic Level Accuracy: 0% Submissions: 0 Points: 5

Write a JavaScript function to determine if a given object is empty. An empty object is one that has no enumerable properties. The function should return true if the object is empty, and false otherwise.

Example 1
    
  
  • Input: obj = {}
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  • Output: true
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  • Explanation: 
    • The input object {} has no properties. 
    • Object.keys() returns an empty array []. 
    • The length of empty array is 0. 
    • Since length is 0, the object is empty. 
    • Therefore, the function returns true.
    •
Example 2
    
  
  • Input: obj = {name: "John", age: 25}
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  • Output: false
    • 
  
  • Explanation: 
    • The input object has two properties: "name" and "age". 
    • Object.keys() returns ["name", "age"]. 
    • The length of this array is 2. 
    • Since length is greater than 0, the object is not empty. 
    • Therefore, the function returns false.
    •
Constraints
    
  
  • The input will always be a valid object
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  • Consider only enumerable properties
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  • Nested objects should be treated as properties
    • 
  
  • Time Complexity: O(1) average case, O(n) worst case where n is number of properties
    • 
  
  • Space Complexity: O(n) for storing keys array
    •
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Hint
Solution

Solution Hints

    
  
  • Use Object.keys() method to get all enumerable property names
    • 
  
  • Check the length of the returned array
    • 
  
  • If length is 0, the object is empty
    • 
  
  • Alternative approach: use Object.getOwnPropertyNames() for all properties
    • 
  
  • Consider using for...in loop as another approach
    • 
  
  • Handle null and undefined cases if needed
    •

Steps to solve by this approach:

 Step 1: Use Object.keys() method to extract all enumerable property names from the object.
 Step 2: Object.keys() returns an array containing all the property names.
 Step 3: Check the length property of the returned array.
 Step 4: If the length equals 0, it means no properties exist.
 Step 5: Return true if length is 0 (empty object), false otherwise.
 Step 6: This approach works for all types of property values including arrays, objects, and primitives.

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