Custom Sort

Write a function that takes an array containing a mix of characters and numbers and returns a sorted array. The sorted array should have all characters (letters) in ascending order first, followed by all numbers in ascending order.

Input:

A single array arr consisting of a mix of characters (strings of length 1) and numbers. The array is unsorted.

Return a new array where:

• All characters (strings of length 1) are sorted alphabetically, followed by
• All numbers sorted in ascending numerical order.

Constraints & Edge Cases

• You must not use built-in sorting methods like Array.prototype.sort().
• The input array may contain both lowercase and uppercase characters. Case-sensitive sorting should be followed (e.g., 'A' < 'a').
• The array may contain duplicate characters or numbers — retain all occurrences.
• The array may contain only characters or only numbers.
• An empty array should return an empty array.
• All elements are either single-character strings or numbers. Any other types (like objects, arrays, booleans) are not considered valid input (you may assume the input will be clean).

Example 1

Input:

['g', 's', 5, 2, 'c', 'e', 6, 1, 'a']

Output:

['a', 'c', 'e', 'g', 's', 1, 2, 5, 6]

Example 2

Input:

[3, 'z', 'b', 10, 'a', 1, 'd']

Output:

['a', 'b', 'd', 'z', 1, 3, 10]