refactor:functional

Refactor this Swift codebase to follow functional programming principles:

Replace Mutability with Immutability

Convert var to let wherever possible Replace mutable collections with immutable transformations Use value types (structs/enums) instead of reference types (classes) where appropriate Eliminate property mutations in favor of creating new instances

Extract Pure Functions

Identify functions with side effects and refactor them to be pure Move I/O operations (network calls, file access, database queries) to the edges of the system Replace stateful methods with functions that take input and return output Ensure functions don't modify external state or rely on mutable global variables

Use Higher-Order Functions