Not accesible propotype in javascript object

Question

If I create a simple object like

var a = {foo: 1};

Why I can access to its prototype this way ?

a.prototype

I get undefined on the console

possible duplicate of [this](https://stackoverflow.com/questions/7662147/how-to-access-object-prototype-in-javascript) — Vencovsky, Mar 19 '19 at 12:53
Possible duplicate of [\_\_proto\_\_ VS. prototype in JavaScript](https://stackoverflow.com/questions/9959727/proto-vs-prototype-in-javascript) — adiga, Mar 19 '19 at 13:19

score 0 · Answer 1 · answered Mar 19 '19 at 12:50

0

You can find the object's prototype this way:

a.__proto__

obj.prototype can be used to set new prototype to the object.

answered Mar 19 '19 at 12:50

marsibarsi

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7

score 0 · Accepted Answer · answered Mar 19 '19 at 12:51

Functions have a prototype property not regular objects. The prototype property points to an object that child objects created with new will be linked to.

Objects are prototype linked however. However this is not the same thing as the prototype property of functions This naming is a bit of confusing.

For example:

var a = {foo: 1}; 

// the prototype of a
console.log(Object.getPrototypeOf(a))
// the same as __proto__
console.log(a.__proto__ === Object.getPrototypeOf(a))

// the .protoype property:
function Test(){}
// it's just an empty object unless you change it
console.log(Test.prototype)

// instance are prototype linked to this
let instance = new Test()
console.log(instance.__proto__ === Test.prototype)

Not accesible propotype in javascript object

2 Answers2