How line-by-line text comparison works
Understand line tokens, longest common subsequences, deterministic edit records and the limits of a syntactic text comparison.
Read articleLine diff explained
Line comparison with explicit rules
Three guides explain LCS alignment, whitespace and final newlines, and deterministic choices around repeated lines.
Whitespace, line endings and the final newline in a text diff
Learn what exact, edge-whitespace and all-whitespace matching change—and what remains visible in the source versions.
Read articleWhy repeated lines can produce different valid diffs
See why more than one shortest alignment can exist and how a stable removal-first rule makes results reproducible.
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