Implementing a Custom Split Type in TypeScript

The split function is a fundamental utility in many programming languages, breaking a string into an array of substrings based on a delimiter. TypeScript's built-in split method is powerful, but sometimes you need more control or a different splitting logic. This challenge asks you to implement a custom "split type" function that leverages TypeScript's advanced type system to provide type safety and potentially more sophisticated splitting behavior.

Problem Description

You are tasked with creating a function called splitType that takes a string and a delimiter as input and returns a tuple of strings. The function should behave similarly to the built-in String.prototype.split() method, but with a focus on providing type safety and demonstrating TypeScript's type manipulation capabilities. The function should split the input string based on the provided delimiter and return an array of strings.

Key Requirements:

• Type Safety: The function should be type-safe, ensuring that the input is a string and the delimiter is also a string.
• Delimiter Handling: The function should correctly handle the delimiter, splitting the string at each occurrence of the delimiter.
• Empty Strings: The function should handle cases where the delimiter appears consecutively or at the beginning/end of the string, resulting in empty strings in the output array.
• No Delimiter: If the delimiter is not found in the string, the function should return an array containing the original string.

Expected Behavior:

The splitType function should take two string arguments: str (the string to split) and delimiter (the string to split by). It should return a tuple of strings representing the split parts of the original string.

Examples

Example 1:

Input: splitType("hello world", " ")
Output: ["hello", "world"]
Explanation: The string "hello world" is split at each space character, resulting in two strings: "hello" and "world".

Example 2:

Input: splitType("apple,banana,cherry", ",")
Output: ["apple", "banana", "cherry"]
Explanation: The string "apple,banana,cherry" is split at each comma character, resulting in three strings: "apple", "banana", and "cherry".

Example 3:

Input: splitType("abc", "d")
Output: ["abc"]
Explanation: The delimiter "d" is not found in the string "abc", so the function returns an array containing the original string.

Example 4:

Input: splitType("a,,b", ",")
Output: ["a", "", "b"]
Explanation: Consecutive delimiters result in empty strings in the output array.

Example 5:

Input: splitType(",abc", ",")
Output: ["", "abc"]
Explanation: A delimiter at the beginning of the string results in an empty string at the beginning of the output array.

Constraints

• The input string str can be of any length (including empty).
• The delimiter delimiter can be an empty string or any other string.
• The function must be implemented in TypeScript.
• The function should not use the built-in String.prototype.split() method directly. The goal is to demonstrate type manipulation and splitting logic.
• Performance is not a primary concern for this challenge, but avoid excessively inefficient algorithms.

Notes

Consider using TypeScript's type inference and conditional types to ensure type safety. Think about how to handle edge cases like empty delimiters and consecutive delimiters. You can leverage string manipulation methods like indexOf and substring extraction to implement the splitting logic. The return type should be a tuple of strings, not a regular array. This emphasizes the type-safe nature of the solution.