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{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is a prototype in JavaScript?","acceptedAnswer":{"@type":"Answer","text":"A prototype is an object that other objects can inherit properties and methods from. Every JavaScript object has a hidden [[Prototype]] property that links to another object. When you access a property that does not exist on an object, JavaScript looks up the prototype chain."}},{"@type":"Question","name":"What is the prototype chain?","acceptedAnswer":{"@type":"Answer","text":"The prototype chain is a series of linked objects. When accessing a property, JavaScript first looks on the object itself, then on its prototype, then on that prototype's prototype, and so on until it finds the property or reaches null (the end of the chain)."}},{"@type":"Question","name":"What is the difference between __proto__ and prototype?","acceptedAnswer":{"@type":"Answer","text":"__proto__ is a property on every object that points to its prototype. prototype is a property on constructor functions that becomes the __proto__ of instances created with new. Use Object.getPrototypeOf() instead of __proto__ in modern code."}},{"@type":"Question","name":"How do you create an object with a specific prototype?","acceptedAnswer":{"@type":"Answer","text":"Use Object.create(proto) to create a new object with the specified prototype. This is the recommended way to set up prototypal inheritance. You can also use constructor functions with new, which automatically sets the prototype."}},{"@type":"Question","name":"Why use prototypes instead of adding methods to each object?","acceptedAnswer":{"@type":"Answer","text":"Methods on the prototype are shared by all instances, saving memory. Instead of each object having its own copy of every method, all objects reference the same method on the prototype. This is more efficient for objects with many instances."}}]}