List Sorter — Alphabetical, Numerical, Length-Based, and Custom Ordering for Any List

Sorting a list correctly requires deciding what "correctly" means before touching the data — a decision that has more variation than most users expect. Alphabetical sorting in English is straightforward for ASCII text but produces surprising results for lists with mixed case (uppercase letters sort before lowercase in ASCII order, so "Banana" sorts before "apple"), numbers embedded in strings ("item10" sorts before "item9" in lexicographic order but after it in natural sort order), and special characters (how does a list with hyphens, apostrophes, and parentheses sort relative to letters?). Numerical sorting requires distinguishing integers from floats and handling negative numbers, currency symbols, and percentage signs that should be stripped before sorting. The list sorter handles all of these edge cases with explicit sorting mode selection so the output matches the intended ordering rather than the language's default comparison semantics.

Natural sort order is the sorting algorithm that matches human intuition for lists containing numbers embedded in text. In standard lexicographic order, the sequence "file1.txt", "file10.txt", "file2.txt", "file20.txt" sorts as written — because "10" sorts before "2" character by character ("1" < "2"). In natural sort order, the same sequence sorts as "file1.txt", "file2.txt", "file10.txt", "file20.txt" — because the embedded numbers are compared numerically rather than lexicographically. This difference matters for any list of filenames, version numbers, item identifiers, or any other strings where embedded numeric values have ordering significance. Natural sort is the correct algorithm for virtually all user-facing lists containing mixed alphanumeric strings; lexicographic sort is correct only for lists of pure text with no embedded numbers.

Custom sort orders solve the ordering problem for categorical data that has a meaningful sequence that alphabetical or numerical ordering does not capture. Days of the week sort alphabetically as Friday, Monday, Saturday, Sunday, Thursday, Tuesday, Wednesday — the correct ordering for a list of meeting days is obviously Monday through Sunday. Month names sort alphabetically into nonsense order. Priority levels (Critical, High, Medium, Low) sort alphabetically in reverse priority order. Survey responses (Strongly Agree, Agree, Neutral, Disagree, Strongly Disagree) sort alphabetically as Agree, Disagree, Neutral, Strongly Agree, Strongly Disagree. Custom sort order allows specifying the canonical sequence for categorical values so sorted lists reflect domain knowledge rather than lexicographic coincidence.