Why Object() != Object() in JavaScript? [duplicate]

Question

So the question is that two same objects are not equal in JavaScript, let's say:

Object() == Object()

or even:

[{a: 1}, {a: 2}].indexOf({a: 1}); //returns -1 not found

What's the reason of this strange behavior?

Answer 1

Objects are compared by reference. And two references are equal only if they point to the same object.

Answer 2

Objects are reference and when you compare two reference they return false.

The other answer(given by Eamon Nerbonne) here has a very relevant point:

Objects are considered equivalent when

• They are exactly equal per === (String and Number are unwrapped first to ensure 42 is equivalent to Number(42))
• or they are both dates and have the same valueOf()
• or they are both of the same type and not null and...
  • they are not objects and are equal per == (catches numbers/strings/booleans)
  • or, ignoring properties with undefined value they have the same properties all of which are considered recursively equivalent.