Diff Algorithms Explained: Myers, Patience, and Histogram Diff
How text diff algorithms work: Myers diff, Patience diff, and Histogram diff. When each algorithm produces better output for code vs prose.
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Tags: text, developer-tools, programming
Diff Algorithms: Myers, Patience, and Histogram Compared When you run , the output looks simple: green lines added, red lines removed. But behind that output is a carefully designed algorithm choosing the most readable way to present what changed. Not all diff algorithms produce the same output — and the differences matter when you are reviewing code. This guide explains the three diff algorithms you are most likely to encounter: Myers (the git default), Patience (better for refactored code), and Histogram (Git's improved Patience). Myers Algorithm (Git Default) Myers' algorithm (1986) finds the optimal (shortest) edit script. It is the git default since the beginning. How It Works Myers uses dynamic programming with a greedy approach to find the shortest edit distance. It searches in a…
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