ECMAScript equality: Is null of Type Object?

Question

I am trying to implement the algorithm described in ES262, The Abstract Equality Comparison Algorithm. It states:

1. If Type(x) is the same as Type(y), then

   a. If Type(x) is Undefined, return true.

   b. If Type(x) is Null, return true.

So when we perform the comparison:

console.log(null == {})

it should evaluate to true, because null and {} have the same type. Do I understand it correctly?

Answer 1

it should evaluate to true because null and {} have the same type and x is null,

This is your mistake.

• null is of the Null Type
• {} is of the Object Type

The types are different.