Prototypal inheritance
🏷️ Javascript
Objects have a hidden property [[Prototype]], which is either null or references to another object (a prototype)
Access [[Prototype]]: obj.__proto__
Set [[Prototype]] value:
obj.__proto__ = value;value can be either an object or null
When accessing a missing property from object, Javascript will find it from the prototype
Prototype is only used for reading properties
Writing/deleting works directly with the object except accessor properties
The value of this in a method call is always the object before the dot
for..in loops over both own and inherited keys of the object
obj.hasOwnProperty(key): return true if obj has own (not inherited) property key