# ruby/rubygems

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3,936 stars · 1,915 forks · Ruby · NOASSERTION

## Links

- GitHub: https://github.com/ruby/rubygems
- Homepage: https://rubygems.org/
- awesome-repositories: https://awesome-repositories.com/repository/ruby-rubygems.md

## Topics

`package-manager` `ruby` `rubygems`

## Description

RubyGems is a package manager for the Ruby language, serving as a tool for packaging, distributing, and installing libraries and software extensions. It functions as a dependency resolver and registry client, managing the installation of required libraries and their recursive dependencies to ensure consistent environments across development and production.

The system handles the complete package lifecycle, including the building of distributable archives, the compilation of native C extensions for high-performance system integration, and the publishing of stable or prerelease versions to registries. It provides a security framework that includes cryptographic package signing, multi-factor authentication for publishing, and role-based access control for collaborative package ownership and organization management.

Broad capabilities cover environment isolation through project-specific directories, version locking via manifest files to guarantee reproducible builds, and runtime load path manipulation. The toolset also includes registry administration features such as private repository hosting, remote source mirroring, and API request throttling.

The command-line interface provides utilities for API key management, installed package inspection, and a built-in documentation viewer for libraries.

## Tags

### Development Tools & Productivity

- [Dependency Installers](https://awesome-repositories.com/f/development-tools-productivity/dependency-managers/installation-resolution-utilities/dependency-installers.md) — Automates the retrieval and installation of libraries and their recursive dependencies from remote registries. ([source](https://guides.rubygems.org/dependency_management))
- [Ruby Dependency Managers](https://awesome-repositories.com/f/development-tools-productivity/ruby-dependency-managers.md) — Provides the primary system for resolving and installing Ruby gem dependencies to ensure consistent environments.
- [C Extension Compilation](https://awesome-repositories.com/f/development-tools-productivity/compilers-toolchains/c-extension-interfaces/c-extension-compilation.md) — Executes platform-specific build scripts to compile C-based extensions for high-performance system access. ([source](https://guides.rubygems.org/gems-with-extensions))
- [Custom Load-Path Extensions](https://awesome-repositories.com/f/development-tools-productivity/custom-load-path-extensions.md) — Automatically extends the system load path to incorporate library directories when code is required. ([source](https://guides.rubygems.org/rubygems-basics/))
- [Package Publishing](https://awesome-repositories.com/f/development-tools-productivity/dependency-managers/artifact-distribution-systems/package-publishing.md) — Uploads and distributes project packages to registries for version management and code sharing. ([source](https://guides.rubygems.org/make-your-own-gem))
- [Ownership Management](https://awesome-repositories.com/f/development-tools-productivity/dependency-managers/artifact-distribution-systems/package-publishing/ownership-management.md) — Assigns package ownership to collective organization identities to ensure continuity during team transitions. ([source](https://guides.rubygems.org/organizations))
- [Package Search](https://awesome-repositories.com/f/development-tools-productivity/dependency-managers/artifact-distribution-systems/software-packages/package-search.md) — Implements search and discovery mechanisms for finding available libraries within the registry. ([source](https://guides.rubygems.org/rubygems-org-api))
- [Dependency Analysis](https://awesome-repositories.com/f/development-tools-productivity/homebrew-packages/dependency-analysis.md) — Identifies and tracks the relationship between installed packages and their required dependencies. ([source](https://guides.rubygems.org/command-reference))
- [Source Specifications](https://awesome-repositories.com/f/development-tools-productivity/installed-package-management/language-specific-package-managers/source-specifications.md) — Specifies multiple fetch locations for libraries, including public servers, private registries, and Git repositories. ([source](https://guides.rubygems.org/gemfile))
- [Development Dependency Management](https://awesome-repositories.com/f/development-tools-productivity/package-dependency-management/development-dependency-management.md) — RubyGems specifies separate sets of libraries required for production execution versus local development and testing. ([source](https://guides.rubygems.org/patterns))
- [Standard Library Management](https://awesome-repositories.com/f/development-tools-productivity/package-manager-installers/standard-library-management.md) — RubyGems handles the installation and updating of core libraries shipped with the environment. ([source](https://guides.rubygems.org/default-gems-and-bundled-gems))
- [Package Sources](https://awesome-repositories.com/f/development-tools-productivity/package-sources.md) — Defines custom dependency indexes, remote repository URIs, and authentication credentials for private assets. ([source](https://guides.rubygems.org/command-reference))
- [Package Uninstallers](https://awesome-repositories.com/f/development-tools-productivity/package-uninstallers.md) — RubyGems removes a library from the local system with optional checks for dependent packages. ([source](https://guides.rubygems.org/command-reference))
- [Project Dependency Specifications](https://awesome-repositories.com/f/development-tools-productivity/project-dependency-specifications.md) — Defines required libraries and version constraints in a manifest file to ensure consistent environment setups. ([source](https://guides.rubygems.org/dependency_management))
- [Version Locking](https://awesome-repositories.com/f/development-tools-productivity/project-version-managers/toolchain-versioning/version-locking.md) — Generates lockfiles that record specific dependency versions and checksums to guarantee reproducible environments.
- [Package Metadata Indexing](https://awesome-repositories.com/f/development-tools-productivity/software-package-repositories/package-metadata-indexing.md) — Creates specification files and index metadata required for a static package source to be discoverable. ([source](https://guides.rubygems.org/using-s3-source))
- [Team-Scoped Access Control](https://awesome-repositories.com/f/development-tools-productivity/team-management/team-scoped-access-control.md) — Controls authority over packages and organization settings through team-scoped roles and permissions. ([source](https://guides.rubygems.org/organizations/getting-started))
- [Versioned Binary Execution](https://awesome-repositories.com/f/development-tools-productivity/binary-packaging-tools/temporary-binary-execution/versioned-binary-execution.md) — Executes command-line tools provided by dependencies within a versioned environment to avoid system-wide conflicts. ([source](https://guides.rubygems.org/bundler_workflow))
- [Cross-Platform Build Targets](https://awesome-repositories.com/f/development-tools-productivity/cross-platform-build-targets.md) — Restricts packages to particular operating systems to enable pre-compiled binary builds. ([source](https://guides.rubygems.org/specification-reference))
- [Dependency Consistency Validators](https://awesome-repositories.com/f/development-tools-productivity/dependency-configuration-tools/dependency-consistency-validators.md) — Checks if the locked version of dependencies matches the defined requirements to ensure production stability. ([source](https://guides.rubygems.org/deploying))
- [Dependency Groups](https://awesome-repositories.com/f/development-tools-productivity/dependency-groups.md) — Organizes libraries into named sets to conditionally install or load them based on the environment. ([source](https://guides.rubygems.org/gemfile))
- [Event Hooks](https://awesome-repositories.com/f/development-tools-productivity/event-hooks.md) — Provides mechanisms for triggering custom logic in response to internal lifecycle events. ([source](https://guides.rubygems.org/bundler_plugins))
- [Executable Script Installation](https://awesome-repositories.com/f/development-tools-productivity/executable-script-installation.md) — RubyGems lists scripts to be installed as command-line binaries when the package is deployed. ([source](https://guides.rubygems.org/specification-reference))
- [Git-Based Dependency Installations](https://awesome-repositories.com/f/development-tools-productivity/git-repository-integrators/git-based-dependency-installations.md) — Installs software libraries directly from remote Git repositories using specific branches, tags, or commits. ([source](https://guides.rubygems.org/git))
- [Local Dependency Overrides](https://awesome-repositories.com/f/development-tools-productivity/local-package-management/local-to-remote-package-swaps/local-dependency-overrides.md) — RubyGems redirects a remote git dependency to a local repository to allow immediate testing of changes. ([source](https://guides.rubygems.org/git))
- [Registry Package Removals](https://awesome-repositories.com/f/development-tools-productivity/local-package-management/registry-package-removals.md) — Deletes specific package versions from a remote registry index to prevent further installations. ([source](https://guides.rubygems.org/removing-a-published-gem))
- [Loading Control](https://awesome-repositories.com/f/development-tools-productivity/package-dependency-managers/loading-control.md) — Provides mechanisms to select which specific groups of dependencies are added to the load path during startup. ([source](https://guides.rubygems.org/groups))
- [Package Mirror Hosting](https://awesome-repositories.com/f/development-tools-productivity/package-mirror-hosting.md) — Runs a local copy of a remote registry to improve reliability and speed of internal installations. ([source](https://guides.rubygems.org/resources))
- [OIDC Package Publishers](https://awesome-repositories.com/f/development-tools-productivity/package-publishing-pipelines/trusted-publishing/oidc-package-publishers.md) — Automates releases by using short-lived identity tokens from CI providers instead of static API keys. ([source](https://guides.rubygems.org/trusted-publishing))
- [Package Script Execution](https://awesome-repositories.com/f/development-tools-productivity/package-script-execution.md) — Provides utilities for executing custom commands defined within package manifests. ([source](https://guides.rubygems.org/command-reference))
- [Private Package Registries](https://awesome-repositories.com/f/development-tools-productivity/private-package-registries.md) — Supports hosting and distributing internal software packages within an organization through private registries.
- [Pre-release Versioning](https://awesome-repositories.com/f/development-tools-productivity/release-management/pre-release-versioning.md) — Manages non-stable version identifiers such as alpha, beta, and release candidates. ([source](https://guides.rubygems.org/patterns))
- [Environment-Aware Command Executions](https://awesome-repositories.com/f/development-tools-productivity/shell-script-execution-engines/custom-run-scripts/environment-aware-command-executions.md) — Runs executable scripts within an isolated project environment of locked dependencies. ([source](https://guides.rubygems.org/using_bundler_in_applications))
- [Package Executable Pathing](https://awesome-repositories.com/f/development-tools-productivity/terminal-shell-cli/terminal-cli-enhancements/shell-terminal-utilities/general-enhancements-tooling/terminal-productivity/command-line-utilities/package-executable-pathing.md) — Automatically adds executable files bundled in a package to the system path upon installation. ([source](https://guides.rubygems.org/make-your-own-gem))

### Programming Languages & Runtimes

- [Package Installations](https://awesome-repositories.com/f/programming-languages-runtimes/package-installations.md) — RubyGems downloads and installs a library from local or remote sources into a repository. ([source](https://guides.rubygems.org/command-reference))
- [Dependency Load Path Management](https://awesome-repositories.com/f/programming-languages-runtimes/dependency-load-path-management.md) — Configures the runtime environment to resolve and load all libraries listed in a dependency file. ([source](https://guides.rubygems.org/bundler_setup))
- [Runtime Search Path Manipulation](https://awesome-repositories.com/f/programming-languages-runtimes/import-path-resolution/runtime-search-path-manipulation.md) — Dynamically modifies the runtime load path to resolve and load installed library source files.
- [Native Extension Builders](https://awesome-repositories.com/f/programming-languages-runtimes/native-extension-builders.md) — Utilizes build scripts to compile and install native extensions with environment-specific run paths. ([source](https://guides.rubygems.org/specification-reference))
- [Package Building](https://awesome-repositories.com/f/programming-languages-runtimes/package-building.md) — Creates a distributable file from a package specification. ([source](https://guides.rubygems.org/command-reference))
- [Ruby Package Distribution](https://awesome-repositories.com/f/programming-languages-runtimes/ruby-package-distribution.md) — Packages Ruby libraries and applications into distributable formats to share reusable functionality.
- [Ruby Registry Clients](https://awesome-repositories.com/f/programming-languages-runtimes/ruby-registry-clients.md) — Provides a client for searching, authenticating, and publishing Ruby packages to remote and private repositories.
- [Dependency Version Locking](https://awesome-repositories.com/f/programming-languages-runtimes/ruby-version-managers/dependency-version-locking.md) — Implements version locking via manifest files to guarantee reproducible environments across deployments.
- [Source Library Packaging](https://awesome-repositories.com/f/programming-languages-runtimes/source-library-packaging.md) — Bundles source files and linked libraries into a distributable format containing a dependency manifest. ([source](https://guides.rubygems.org/make-your-own-gem))
- [Installed Package Inspection](https://awesome-repositories.com/f/programming-languages-runtimes/package-installations/installed-package-inspection.md) — Lists all files contained within an installed library, including filterable views for required files. ([source](https://guides.rubygems.org/command-reference))
- [Installed Package Listing](https://awesome-repositories.com/f/programming-languages-runtimes/package-installations/installed-package-listing.md) — Displays all locally installed libraries, including those shipped by default with the runtime. ([source](https://guides.rubygems.org/rubygems-basics/))
- [Environment Isolation](https://awesome-repositories.com/f/programming-languages-runtimes/runtime-execution-environments/runtime-environments/language-runtimes/ruby-environments/environment-isolation.md) — Provides mechanisms for installing libraries into project-specific directories to avoid conflicts between applications.

### Software Engineering & Architecture

- [Recursive Dependency Resolution](https://awesome-repositories.com/f/software-engineering-architecture/recursive-dependency-resolution.md) — Computes a compatible set of library versions by traversing a recursive tree of requirements and constraints.
- [Shared Package Permissions](https://awesome-repositories.com/f/software-engineering-architecture/shared-package-permissions.md) — Allows granting multiple maintainers the authority to push updates to shared packages on the remote registry. ([source](https://guides.rubygems.org/publishing))
- [Toolchain Version Enforcement](https://awesome-repositories.com/f/software-engineering-architecture/configuration-versioning/version-requirement-validators/compiler-version-enforcers/toolchain-version-enforcement.md) — Enforces required language versions and engines to prevent applications from running on incompatible systems. ([source](https://guides.rubygems.org/gemfile))
- [Core Logic Extensions](https://awesome-repositories.com/f/software-engineering-architecture/core-logic-extensions.md) — Implements architectural hooks that allow the injection of custom logic into the package lifecycle. ([source](https://guides.rubygems.org/plugins))
- [Plugin Integrations](https://awesome-repositories.com/f/software-engineering-architecture/integration-extensibility/extensibility/third-party-plugins/plugin-integrations.md) — Integrates third-party plugins to add custom hooks and specialized installation behaviors to the workflow. ([source](https://guides.rubygems.org/bundler_known_plugins))
- [Package Naming Guidelines](https://awesome-repositories.com/f/software-engineering-architecture/naming-conventions/package-naming-guidelines.md) — RubyGems follows a naming convention to signal the correct file structure for requiring the library in code. ([source](https://guides.rubygems.org/name-your-gem))
- [Package Detail Retrievers](https://awesome-repositories.com/f/software-engineering-architecture/package-detail-retrievers.md) — Provides APIs to fetch detailed metadata and specifications for specific package versions. ([source](https://guides.rubygems.org/rubygems-org-api-v2))
- [Hook-Based Plugin Systems](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/architectural-patterns/plugin-module-systems/modular-plugin-architectures/plugin-based-architectures/hook-based-plugin-systems.md) — Allows third-party plugins to register custom logic into the installation and build lifecycle.

### Business & Productivity Software

- [Organization-Based Access Management](https://awesome-repositories.com/f/business-productivity-software/organization-management/organization-based-access-management.md) — Provides role-based access control for team members to manage libraries and organizational settings. ([source](https://guides.rubygems.org/organizations/roles-and-permissions))
- [Registry Organizations](https://awesome-repositories.com/f/business-productivity-software/organization-management/registry-organizations.md) — Establishes shared organizational entities to manage multiple packages under a single identity and handle. ([source](https://guides.rubygems.org/organizations/getting-started))

### DevOps & Infrastructure

- [Isolated Package Deployment](https://awesome-repositories.com/f/devops-infrastructure/deployment-management-strategies/automation-and-tooling/deployment-automation/local-application-deployment/isolated-package-deployment.md) — Installs all required libraries into a project-specific directory to isolate the application from global packages. ([source](https://guides.rubygems.org/using_bundler_in_applications))
- [Library Distribution Bundlers](https://awesome-repositories.com/f/devops-infrastructure/distribution-packaging/library-distribution-bundlers.md) — Packages applications or libraries into optimized artifacts for distribution via registries. ([source](https://guides.rubygems.org/))
- [Dependency Version Locking](https://awesome-repositories.com/f/devops-infrastructure/git-based-deployment/git-submodule-integration/dependency-version-locking.md) — Creates a snapshot of exact versions of all installed libraries to guarantee reproducible environments. ([source](https://guides.rubygems.org/bundler_workflow))
- [Package Metadata](https://awesome-repositories.com/f/devops-infrastructure/package-metadata.md) — RubyGems specifies a package's name, version, authors, and licenses for distribution. ([source](https://guides.rubygems.org/specification-reference))
- [Dependency Versioning](https://awesome-repositories.com/f/devops-infrastructure/version-upgrades/dependency-versioning.md) — Locks specific versions of dependencies in a manifest file to ensure identical environments across commits. ([source](https://guides.rubygems.org/git_bisect))
- [Dependency Version Updates](https://awesome-repositories.com/f/devops-infrastructure/version-upgrades/dependency-versioning/dependency-version-updates.md) — RubyGems updates a specific package to a newer version while preserving other dependencies to prevent regressions. ([source](https://guides.rubygems.org/updating_gems))
- [Version Constraints](https://awesome-repositories.com/f/devops-infrastructure/version-upgrades/dependency-versioning/version-constraints.md) — RubyGems limits compatible library versions using optimistic or pessimistic requirements to prevent breaking changes. ([source](https://guides.rubygems.org/patterns))
- [Custom Source Configurations](https://awesome-repositories.com/f/devops-infrastructure/configuration-source-management/custom-source-configurations.md) — Allows directing the manager to fetch libraries from internal servers instead of the public repository. ([source](https://guides.rubygems.org/run-your-own-gem-server))
- [Custom Installation Sources](https://awesome-repositories.com/f/devops-infrastructure/distribution-packaging/custom-installation-sources.md) — Supports retrieving packages from non-standard locations like cloud storage or version control systems. ([source](https://guides.rubygems.org/bundler_plugins))
- [Package Downloading](https://awesome-repositories.com/f/devops-infrastructure/distribution-packaging/registries/package-directories/package-downloading.md) — RubyGems downloads package files from a remote source for local storage or unpacking. ([source](https://guides.rubygems.org/command-reference))
- [Outdated Package Listings](https://awesome-repositories.com/f/devops-infrastructure/package-installations/outdated-package-listings.md) — Provides commands to display which installed packages have newer versions available for upgrade. ([source](https://guides.rubygems.org/command-reference))
- [Private Package Hosting](https://awesome-repositories.com/f/devops-infrastructure/private-package-hosting.md) — Provides a dedicated environment to store and distribute internal libraries privately. ([source](https://guides.rubygems.org/run-your-own-gem-server))
- [Private Repository Hosting](https://awesome-repositories.com/f/devops-infrastructure/private-repository-hosting.md) — Uses cloud storage buckets to store and serve private packages without managing a dedicated server. ([source](https://guides.rubygems.org/using-s3-source))
- [Repository Mirrors](https://awesome-repositories.com/f/devops-infrastructure/repository-mirrors.md) — Synchronizes remote software repositories to local servers to ensure high availability and speed. ([source](https://guides.rubygems.org/run-your-own-gem-server))
- [Version Upgrades](https://awesome-repositories.com/f/devops-infrastructure/version-upgrades.md) — Identifies libraries with available newer versions and upgrades them while respecting version constraints. ([source](https://guides.rubygems.org/using_bundler_in_applications))
- [Locked Version Updates](https://awesome-repositories.com/f/devops-infrastructure/version-upgrades/dependency-versioning/dependency-version-updates/locked-version-updates.md) — Refreshes specific libraries to the latest compatible versions while respecting defined version constraints. ([source](https://guides.rubygems.org/bundler_workflow))

### Security & Cryptography

- [Package Ownership Management](https://awesome-repositories.com/f/security-cryptography/identity-access-management/access-control/identity-role-management/multi-tenant-identity-management/package-ownership-management.md) — Manages membership and access control roles for coordinating the maintenance of shared software packages. ([source](https://guides.rubygems.org/))
- [Package Integrity Verifications](https://awesome-repositories.com/f/security-cryptography/package-integrity-verifications.md) — Validates cryptographic signatures and checksums during installation to ensure packages have not been tampered with. ([source](https://guides.rubygems.org/security))
- [Package Signing](https://awesome-repositories.com/f/security-cryptography/package-signing.md) — Attaches RSA signatures and checksums to packages to ensure code integrity and origin authenticity. ([source](https://guides.rubygems.org/security))
- [Role-Based Access Control](https://awesome-repositories.com/f/security-cryptography/role-based-access-control.md) — Implements a role-based system to regulate administrative actions and library management. ([source](https://guides.rubygems.org/organizations))
- [Organization Role Assignments](https://awesome-repositories.com/f/security-cryptography/role-based-access-control/workspace-role-assignments/organization-role-assignments.md) — Assigns access roles to users at the organization level to control shared package management. ([source](https://guides.rubygems.org/organizations/managing-members))
- [API Key Lifecycle Management](https://awesome-repositories.com/f/security-cryptography/api-access-security/api-key-generation/api-key-lifecycle-management.md) — Provides a command-line interface to create and update scoped API keys for CI automation. ([source](https://guides.rubygems.org/api-key-scopes))
- [API Key Management](https://awesome-repositories.com/f/security-cryptography/api-key-management.md) — Provides a system for generating and managing API keys to secure programmatic access to the registry. ([source](https://guides.rubygems.org/rubygems-org-api))
- [Client-to-Server Authentication](https://awesome-repositories.com/f/security-cryptography/authentication-clients/client-to-server-authentication.md) — Handles secure client-to-server authentication for managing credentials and uploading packages to registries. ([source](https://guides.rubygems.org/command-reference))
- [API Key Scopes](https://awesome-repositories.com/f/security-cryptography/identity-access-management/access-control/data-resource-permissions/api-key-scopes.md) — Implements granular scopes for API keys to restrict actions and enforce the principle of least privilege. ([source](https://guides.rubygems.org/api-key-scopes))
- [CI/CD OIDC Token Exchanges](https://awesome-repositories.com/f/security-cryptography/identity-federation-providers/web-identity-token-exchange/identity-assertion-token-exchanges/ci-cd-oidc-token-exchanges.md) — Supports swapping OIDC identity tokens from CI providers for short-lived API keys to enable secure automated publishing. ([source](https://guides.rubygems.org/rubygems-org-api))
- [Multi-Factor Authentication](https://awesome-repositories.com/f/security-cryptography/multi-factor-authentication.md) — Requires a second verification step via tokens or hardware keys for logins to enhance account security. ([source](https://guides.rubygems.org/setting-up-multifactor-authentication))
- [Package Signing Key Management](https://awesome-repositories.com/f/security-cryptography/package-signing-key-management.md) — Generates and manages RSA keys and certificates specifically for signing packages for security verification. ([source](https://guides.rubygems.org/command-reference))
- [Passkey Authentication](https://awesome-repositories.com/f/security-cryptography/passkey-authentication.md) — Supports passwordless authentication using hardware security devices or passkeys for secure login. ([source](https://guides.rubygems.org/setting-up-webauthn-mfa))
- [Repository Trust Verifiers](https://awesome-repositories.com/f/security-cryptography/trust-verification/repository-trust-verifiers.md) — Enforces security policies that restrict the installation of dependencies based on their signature and verification status. ([source](https://guides.rubygems.org/security))
- [Mandatory MFA Enforcement](https://awesome-repositories.com/f/security-cryptography/two-factor-authentication/mandatory-mfa-enforcement.md) — Mandates multi-factor authentication for all package owners as a prerequisite for publishing new versions. ([source](https://guides.rubygems.org/mfa-requirement-opt-in))
- [Sensitive Action MFA](https://awesome-repositories.com/f/security-cryptography/two-factor-authentication/mandatory-mfa-enforcement/sensitive-action-mfa.md) — Forces one-time password verification for sensitive commands executed via API keys. ([source](https://guides.rubygems.org/api-key-scopes))

### Part of an Awesome List

- [Ruby C Extension Packaging](https://awesome-repositories.com/f/awesome-lists/devtools/c-bindings/ruby-c-extension-wrappers/ruby-c-extension-packaging.md) — Bundles C code as reusable Ruby gems to provide high-performance native extensions.

### Content Management & Publishing

- [Library Ownership Transfers](https://awesome-repositories.com/f/content-management-publishing/library-ownership-transfers.md) — Provides mechanisms for reassigning administrative control of libraries from individual accounts to organizations. ([source](https://guides.rubygems.org/organizations/transferring-gems))

### Data & Databases

- [Package Index Compression](https://awesome-repositories.com/f/data-databases/compact-metadata-storage/package-index-compression.md) — Uses a compact text index for metadata retrieval to minimize data transfer and improve caching. ([source](https://guides.rubygems.org/rubygems-org-api))
- [Remote Registry Indexing](https://awesome-repositories.com/f/data-databases/flat-file-storage/registry-indexes/remote-registry-indexing.md) — Fetches compact metadata files from a central server to discover available package versions efficiently.