Object prototype

1. What is the object prototype?
2. How do you get the prototype of an object?
3. What is __ proto __ and prototype?
4. What is object __ proto __?

What is the object prototype?

Every object in JavaScript has a built-in property, which is called its prototype. The prototype is itself an object, so the prototype will have its own prototype, making what's called a prototype chain. The chain ends when we reach a prototype that has null for its own prototype.

How do you get the prototype of an object?

getPrototypeOf() The Object. getPrototypeOf() static method returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

What is __ proto __ and prototype?

__proto__ is the actual object that is used in the lookup chain to resolve methods, etc. prototype is the object that is used to build __proto__ when you create an object with new : ( new Foo ).

What is object __ proto __?

The __proto__ accessor property of Object. prototype exposes the [[Prototype]] (either an object or null ) of this object. The __proto__ property can also be used in an object literal definition to set the object [[Prototype]] on creation, as an alternative to Object. create() .