Line Sorter

Sorting a list of lines by hand is tedious and error-prone the moment the list gets longer than a handful of items — a spreadsheet-imported list of names, a set of copy-pasted URLs, a to-do list, or CSV-adjacent data pasted straight from an email. This tool covers the sorting operations people reach for most often on plain-text lists, without needing to open a spreadsheet application just to sort a dozen lines. Alphabetical A→Z and Z→A sorting compares each line as text. A "case-insensitive" toggle (on by default) controls whether `Apple` and `apple` are treated as equal for ordering purposes — with it on, `apple`, `Apple` and `APPLE` sort next to each other regardless of casing; with it off, sorting falls back to strict character-code ordering, where all uppercase letters (A–Z) sort before all lowercase letters (a–z) in standard ASCII/Unicode order, which can put `Zebra` before `apple` in a way that looks surprising if you are not expecting it. Case-insensitive is the more intuitive default for everyday lists (names, tags, words), which is why it starts checked. Numerical mode looks for a leading number in each line — not necessarily at the very start of the string, but the first run of digits (optionally with a decimal point and a leading minus sign) found anywhere near the front, so both `10. Item` and `42 apples` are recognized and sorted by 10 and 42 respectively. Lines where no number can be found at all (no digits anywhere) are pushed to the end of the sorted list, and among those number-less lines, their original relative order is preserved rather than being re-sorted by any other criterion — this matters when you are sorting a mixed list like inventory counts where a few rows genuinely have no quantity yet, and you want those left in the order you originally entered them rather than scrambled. By-length mode sorts shortest line first, which is handy for eyeballing a list by how much text each line has (short tags before long descriptions, for example) — line length is measured in actual characters (using `Array.from` to iterate by Unicode code point rather than by UTF-16 code unit), so multi-byte characters like emoji or certain accented letters are counted correctly as one character each rather than being split and over-counted. Reverse simply flips the current line order top-to-bottom without applying any sorting logic — useful when a list is already in a meaningful order (chronological, priority, whatever) and you just want to view or export it backwards. Shuffle applies a Fisher-Yates shuffle, the standard unbiased algorithm for randomly permuting a list (each of the n! possible orderings is equally likely, unlike naive "sort by random comparator" approaches which are neither uniformly random nor guaranteed stable) — because a shuffle is deliberately non-deterministic, it does not run automatically as you type or toggle options the way every other mode does; it only runs when you click the dedicated Shuffle button, so you are never surprised by your list silently re-randomizing itself while you are still typing. The "remove duplicate lines after sort" toggle drops any line that is an exact repeat of an earlier line in the sorted output (respecting the case-insensitive setting for what counts as a duplicate), keeping the first occurrence and discarding the rest — applied after sorting, so which occurrence is "first" depends on the sort order you chose, not necessarily your original paste order.