Keep only even indexes

Extract every element at an even index from a list.

list slicing indexing

Write a function `keep_even_indexes(lst)` that takes a list `lst` and returns a new list containing only the elements at even indices (0, 2, 4, ...). The original list should not be modified.

Constraints

The input list can be empty or contain any number of elements. The elements can be of any type (integers, strings, etc.). The function should work in O(n) time and O(n) space (where n is the length of the input list).

Example

>>> keep_even_indexes([0, 1, 2, 3, 4, 5])
[0, 2, 4]
>>> keep_even_indexes(['a', 'b', 'c', 'd'])
['a', 'c']
>>> keep_even_indexes([])
[]

5 points ~5 min

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Hints

Use list slicing with a step of 2.

Remember that indices are 0-based.

Even indices are 0, 2, 4, and so on.

Test Results

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