Swift - Binary Operator == cannot be applied to two [[Double]] operands [duplicate]

Answer 1

In this case there is nothing misleading.

Normally the == operator is defined for Equatable items. That allows two Double values to be compared to each other, e.g. 1.0 == 1.0.

Then we have a specific == operator defined on Arrays of Equatable items:

public func ==(lhs: [Element], rhs: [Element]) -> Bool

That means that you can compare any arrays with equatable items. However, the arrays themselves are not Equatable.

There is no such operator defined for nested arrays.

You would have to define:

public func ==(lhs: [[Element]], rhs: [[Element]]) -> Bool {
   ...
}