Learn the best methods to count properties in JavaScript objects. Discover Object.keys(), Object.getOwnPropertyNames(), and Reflect.ownKeys() with practical examples and performance comparisons.
Learn multiple methods to iterate through JavaScript objects including for...in loops, Object.keys(), Object.values(), and Object.entries(). Get practical examples and best practices for efficient object iteration.
Learn how to properly store JavaScript objects in localStorage using JSON.stringify() and JSON.parse(). Complete guide with examples, error handling, and best practices for preserving object structure.
Learn how to merge JavaScript objects using Object.assign(), spread operator, and custom methods. Handle conflicts and optimize performance with our complete guide.