__Proto__ , prototype

1. What is __ proto __ and prototype?
2. Is __ proto __ same as [[ prototype ]]?
3. What does __ proto __ mean in JavaScript?
4. Is __ proto __ deprecated?

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 ).

Is __ proto __ same as [[ prototype ]]?

In reality, the only true difference between prototype and __proto__ is that the former is a property of a class constructor, while the latter is a property of a class instance.

What does __ proto __ mean in JavaScript?

setPrototypeOf() instead. 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.

Is __ proto __ deprecated?

__proto__ property has been deprecated as of ECMAScript 3.1 and shouldn't be used in the code. Use Object. getPrototypeOf and Object. setPrototypeOf instead.