Is object empty

81.8% acceptance

Mar 2, 2026

222

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.

Solution

TypeScript

Time O(1)

Space O(1)

LeetCode

solution.ts

type JSONValue =
  | null
  | boolean
  | number
  | string
  | JSONValue[]
  | { [key: string]: JSONValue };
type Obj = Record<string, JSONValue> | JSONValue[];

function isEmpty(obj: Obj): boolean {
  if (Array.isArray(obj)) return obj.length === 0;
  return Object.keys(obj).length === 0;
}