Description

isEmpty returns true if the provided value is null or undefined, or if it’s an object (including arrays) with zero own enumerable keys. Otherwise, it returns false.

Code Byte

export const isEmpty = (val: any): boolean => {
  return val == null || (typeof val === 'object' && Object.keys(val).length === 0);
}

Use cases:

• Input validation: Quickly check if an object or array has any data before processing.
• Form handling: Skip submission or show warnings when required fields are empty.
• API responses: Guard against empty payloads before rendering UI.
• Default values: Fall back to defaults when objects are empty.

Example usage:

import { isEmpty } from './is-empty.util';

console.log(isEmpty(null));         // true
console.log(isEmpty(undefined));    // true
console.log(isEmpty({}));           // true
console.log(isEmpty([]));           // true
console.log(isEmpty({ foo: 1 }));   // false
console.log(isEmpty([1, 2, 3]));    // false