Right Answer: The `limitToFirst` method in Firebase is used to retrieve a specified number of items from the beginning of a query result. For example, `limitToFirst(10)` will return the first 10 items in the ordered data set.
Right Answer: The types of Firebase Database Rules are:
1. **Read Rules** - Control who can read data.
2. **Write Rules** - Control who can write data.
3. **Validation Rules** - Ensure data meets certain criteria before being written.
Right Answer: The different types of event types for reading data in Firebase are:
1. `value`: Triggered once for the initial data and then again whenever the data changes.
2. `child_added`: Triggered for each child node when the listener is attached and for each new child added.
3. `child_changed`: Triggered when a child node is changed.
4. `child_removed`: Triggered when a child node is removed.
5. `child_moved`: Triggered when a child node changes its position in the list.
Right Answer: The `limitToLast` method in Firebase is used to retrieve a specified number of the last items from a query result. It allows you to limit the results to the last N children in a list, making it useful for displaying the most recent entries in a database.
Tags in Git are used to mark specific points in the repository's history, often to denote release versions. To create a tag, use the command `git tag <tag-name>`. To push tags to the remote repository, use `git push origin <tag-name>` or `git push –tags` to push all tags at once.
`git fetch` downloads changes from the remote repository to your local repository but does not merge them into your working directory. `git pull` does both: it fetches the changes and then merges them into your current branch.
Git cherry-pick is a command that allows you to apply the changes from a specific commit in one branch to another branch. You would use it when you want to selectively apply certain commits without merging the entire branch, such as when you need a bug fix or feature from another branch without bringing in all other changes.
A detached HEAD in Git occurs when the HEAD pointer is not pointing to a branch, but directly to a specific commit. This means you are not on a branch, and any new commits will not be associated with any branch until you create a new branch or switch back to an existing one.
The main branch is typically the default branch for development and contains the latest stable code, while the gh-pages branch is specifically used for hosting static websites directly from a GitHub repository.
You can secure secrets and environment variables in GitHub Actions by using GitHub Secrets. Store sensitive information in the repository settings under "Secrets" and reference them in your workflow files using the syntax `${{ secrets.SECRET_NAME }}`.
GitHub Actions is a feature that allows you to automate workflows directly in your GitHub repository. It enables you to create custom software development lifecycle workflows, such as building, testing, and deploying code, triggered by events like pushes, pull requests, or scheduled times.
To create a new repository on GitHub, follow these steps:
1. Log in to your GitHub account.
2. Click the "+" icon in the top right corner and select "New repository."
3. Enter a name for your repository and optional description.
4. Choose the repository visibility (public or private).
5. Optionally, initialize the repository with a README, .gitignore, or license.
6. Click the "Create repository" button.
