6 August 2024

To check if an object is empty in JavaScript, you can use several methods. You might prefer using Object.keys() to check if an object is empty because it offers clarity, readability, and conciseness. The method Object.keys(obj).length === 0 explicitly checks the length of the keys array, making it clear that you are verifying if the object has any properties. It accomplishes the task in a single line, ensuring the code is concise without sacrificing readability. Additionally, Object.keys() is performant for most use cases and well-supported across all modern JavaScript environments, providing consistent behavior. This method also only returns the object's own enumerable property names, preventing inherited properties from being considered and making the check more accurate for the object's direct properties.

Source code viewer
  1. function isEmpty(obj) {
  2.     return Object.keys(obj).length === 0;
  3. }
  4.  
  5. // Example usage:
  6. const obj1 = {};
  7. const obj2 = { key: 'value' };
  8.  
  9. console.log(isEmpty(obj1)); // true
  10. console.log(isEmpty(obj2)); // false
Programming Language: Javascript