Question

Differentiate between the pure method and Impure method.

Answer 1

Feature	Pure Method	Impure Method
State Modification	Does not modify the original state of the object or any external data.	Modifies the state of the object, instance variables, or global variables.
Side Effects	Has zero side effects (no changes to files, console output, or database records).	Has side effects because it changes data variables or prints output to the environment.
Output Consistency	Always returns the exact same output if given the exact same input arguments.	May return different outputs for the same inputs if internal or external states change.
Passing Mechanism	Typically relies on call by value using primitive data variables.	Typically relies on call by reference using object references or arrays.
Common Use Case	Case is used for mathematical operations, sorting arrays safely, or checking boolean conditions.	Used for updating an object's profile, saving records, or tracking incrementing IDs.