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When working with Git, keeping a clean project history is essential, especially in team environments. Two of the most common ways to integrate changes from one branch into another are
Git Merge: Preserving History
Merging is a non-destructive operation. When you merge a feature branch into
How it works:
Pros:
Cons:
Git Rebase: Rewriting History
Rebasing, on the other hand, moves or combines a sequence of commits to a new base commit. It essentially takes your feature branch, finds the point where it diverged from
How it works:
Pros:
Cons:
Summary: Which one should you use?
*Golden Rule:* Never rebase commits that you have already pushed to a remote repository shared with others!
git merge and git rebase. While both achieve the same ultimate goal—combining code—they do so in fundamentally different ways.Git Merge: Preserving History
Merging is a non-destructive operation. When you merge a feature branch into
main, Git creates a new "merge commit" that ties the two branch histories together.How it works:
Bash:
git checkout main
git merge feature-branchPros:
- Context: Preserves the exact chronological history of when changes were made and merged.
- Safety: Existing branches are not changed, making it safe for public repositories.
Cons:
- Cluttered History: If you have many developers working on short-lived branches, your project graph can become messy with numerous merge commits.
Git Rebase: Rewriting History
Rebasing, on the other hand, moves or combines a sequence of commits to a new base commit. It essentially takes your feature branch, finds the point where it diverged from
main, and replays all your feature branch commits on top of the current main tip.How it works:
Bash:
git checkout feature-branch
git rebase mainPros:
- Clean History: Results in a linear project history without unnecessary merge commits. Makes tools like
git logandgit bisectmuch easier to use.
Cons:
- Risk of Errors: Rebasing rewrites history. If you rebase commits that have already been pushed to a shared remote repository, you will disrupt your team's workflow and force them to do hard resets.
Summary: Which one should you use?
- Use Merge when working on shared public branches where preserving the exact historical timeline is important.
- Use Rebase for local, unpushed feature branches to keep your commit history clean and linear before merging into production.
*Golden Rule:* Never rebase commits that you have already pushed to a remote repository shared with others!