How are data collections implemented and operate internally within the system?

In iOS data collections such as arrays, dictionaries, and sets, they are implemented at a low level using optimized data structures and algorithms.

For example:

• Array is usually implemented as a dynamic array that stores elements in a contiguous block of memory. When adding elements, if there is not enough space, a new larger memory block is allocated, and data is copied.
• Dictionary is implemented as a hash table, where keys are hashed for quick access to values. Collision resolution methods such as chaining or open addressing may be used.
• Set is similar to a dictionary but only stores keys without values.

These collections are optimized for performance and safety, using ARC (Automatic Reference Counting) mechanisms to manage memory and ensure fast data operations.