Filter by Digit Length

Create a function that filters out a list to include numbers that only have a certain number of digits.

Examples

filter_digit_length([88, 232, 4, 9721, 555], 3) ➞ [232, 555]
# Include only numbers with 3 digits.

filter_digit_length([2, 7, 8, 9, 1012], 1) ➞ [2, 7, 8, 9]
# Include only numbers with 1 digit.

filter_digit_length([32, 88, 74, 91, 300, 4050], 1) ➞ []
# No numbers with only 1 digit exist => return empty list.

filter_digit_length([5, 6, 8, 9], 1) ➞ [5, 6, 8, 9]
# All numbers in the list have 1 digit only => return original list.

Notes

• If no numbers of the specified digit length exist, return an empty list.
• If all numbers in the list have the specified digit length, return the original list.
• The sub-list returned should have the same relative order as the original list.