List Comprehension Master

Problem Statement

Use list comprehensions to transform data efficiently.

Background

List comprehensions provide a concise way to create lists:

[expression for item in iterable if condition]

Your Task

Write a function transform_list(numbers) that returns a dictionary with various transformations.

Output Format

Return a dictionary with:

"squared": Each number squared
"evens": Only even numbers
"positive": Only positive numbers
"doubled_evens": Even numbers doubled
"abs_values": Absolute value of each number

Example:

Input:

[-3, -2, -1, 0, 1, 2, 3, 4]

Output:

{'squared': [9, 4, 1, 0, 1, 4, 9, 16], 'evens': [-2, 0, 2, 4], 'positive': [1, 2, 3, 4], 'doubled_evens': [-4, 0, 4, 8], 'abs_values': [3, 2, 1, 0, 1, 2, 3, 4]}

Reasoning:

List comprehensions with conditions filter and transform efficiently

Constraints:

Use list comprehensions
Preserve original order