Are Function.prototype.propertyname and Object.propertyname equivalent?

During my exploration of JavaScript prototypes, I came across something that has left me puzzled. Despite understanding that functions are considered first-class objects, I am struggling to comprehend why the 'Object' now possesses a property after the property was set on 'Function.prototype'.


Function.prototype.customProperty = 'value';

Object.customProperty // Now, even 'Object' has this property and returns 'value'

Object.customProperty === Function.prototype.customProperty // Evaluates to true
javascript

Answer №1

Object functions as a function, and the statement typeof Object == 'function' holds true. By assigning a property to Function.prototype, you will also grant that property to Object within the property chain.

Answer №2

I believe that Function.prototype serves as a prototype for all objects that inherit from it. By assigning Function.prototype.foo = 'bar';, you are essentially making the foo property available to all objects that inherit from Function.prototype. This is why the last line of code evaluates to true.

Answer №3

The reason behind this is that the Object and Function objects share the same underlying [[Prototype]] property.

In line with Ecma-262:

The [[Prototype]] property of the Function prototype object points to the Object prototype object.

Thus, any property added to the Function's prototype can also be accessed through the Object object and vice versa.

To delve deeper into this concept, I recommend referring to the Ecma-262 Specification.

I hope this explanation clarifies things for you.

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