Understanding Singleton Pattern | Dataford Interview Questions

What is a singleton?

Implement a lazy singleton object that creates at most one instance during a function call. The first configuration must be preserved, later configurations must not reinitialize the object, and every request must return the same instance.

Input and Output

The function receives a non-empty list of configuration dictionaries. Return a dictionary containing whether all requests returned the same object and the configuration retained by the singleton.

Constraints

1 <= len(configs) <= 100
Each configuration is a JSON-compatible dictionary
The first configuration must be retained
All requests occur within one function call

Function Signature

def singleton_identity_check(configs):

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