Union combines both lists with duplicates removed. Intersection shows items present in both. A − B shows items in A that are not in B. B − A shows items in B that are not in A. Comparison is case-sensitive. Runs entirely in your browser.
List Operations treats each input panel as a set: lines are trimmed, blanks dropped, and the remainder loaded into a JavaScript Set. The four buttons then run union (every distinct item from either list), intersection (items in both), A − B (items in A but not B) and B − A (items in B but not A). The result panel shows a live count.
Comparison is strict string equality, so 'apple' and 'Apple' stay distinct — pre-lowercase your lists with a text-case tool if you need fuzzy matching. To compute the symmetric difference (items in exactly one list), run A − B and B − A and concatenate. Everything happens locally; nothing about the lists leaves the browser.
Each line is trimmed of surrounding whitespace; blank lines are dropped; the remaining strings are inserted into a JavaScript Set, which deduplicates exact-match duplicates. The result is what gets compared.
Yes. 'apple' and 'Apple' are treated as different items because Set uses strict string equality. Lowercase both lists with a separate text-case tool first if you need case-insensitive matching.
Run A − B and B − A separately and concatenate the two outputs — that gives the symmetric difference (items in exactly one of the lists). The four buttons cover every common pairwise set operation.
No — these are set operations, not multiset (bag) operations. Duplicates inside a single list collapse to one entry, and output order is the iteration order of the underlying Set, which is insertion order in modern engines.
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