Do you prefer arrays or hashes?

Both data types have their advantages and are intended for different scenarios. It's hard to say which one is "better" in an absolute sense, as the choice depends on the task.

• Arrays: Ordered collections of elements, accessed by index (an integer). Ideal for sequential data or when the order of elements matters. Operations like adding/removing at the end of the array are usually fast.

• Hashes: Unordered collections of key-value pairs. Keys can be objects (often symbols or strings), and values can be any objects. Ideal for representing associative data where the relationship between key and value is important. Search, addition, and removal by key are usually very fast (O(1) on average).

Examples of usage:

# Array for a list of users
users = ["Alice", "Bob", "Charlie"]

# Hash for representing a user profile
user_profile = {
  name: "Alice",
  age: 30,
  city: "Kyiv"
}

Main differences:

Criterion	Array	Hash
Order	Yes (by index)	No (by key)
Access	By integer index	By key (object)
Purpose	Sequential data	Associative data
Performance (search)	O(n) (average)	O(1) (average)

In general, I prefer to use the data type that best fits the current task and makes the code more readable and efficient. Arrays are suitable for ordered lists, while hashes are better for associative data.