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$ curl repovive.com/roadmaps/data-structures/persistent-data-structures/application-git-like-vcs

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$ curl repovive.com/roadmaps/data-structures/persistent-data-structures/application-git-like-vcs

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Application: Git-like VCS - Persistent Data Structures | Data Structures | Repovive

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Data Structures19 sections · 729 units49h total

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Application: Git-like VCS

Branching and merging

Version control systems use persistent structures:

Commit: Create new version from current state Branch: Create new reference to a version Checkout: Set working state to any version Merge: Combine two versions (confluent persistence)

class SimpleVCS:
 commits: map from hash to tree_root
 branches: map from name to hash

 function commit(branch, changes)
 parent := commits[branches[branch]]
 newRoot := applyChanges(parent, changes)
 hash := computeHash(newRoot)
 commits[hash] := newRoot
 branches[branch] := hash

 function branch(name, fromBranch)
 branches[name] := branches[fromBranch]

Git's object model is a persistent data structure with content-addressed storage.