Prototypal Inheritance

hidden property [[Prototype]] - null or a reference to other object


prototype obj
     ^
     | [[Prototype]]
     |
    obj

When we read a property from object, and it’s missing, JavaScript takes it from the prototype

obj.__proto__ can be used to set it

let earphones = { speakers: 2 };

let jbl       = { bluetooth: true };

jbl.__proto__ = earphones;  // sets jbl.[[Prototype]] to earphones

alternatively:

let jbl       = {
  bluetooth: true,
  __proto__: earphones
};

Sources, External Links

12apr23

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