default install locations of dependencies, most popular version managers, and popular packages along with their equivalents.

language_crossovers.md

Ruby	JavaScript	Rust
Bundler	npm	Cargo
Manages gem dependencies for Ruby projects	Manages packages for JavaScript projects	Manages packages and dependencies for Rust projects
Gems	Packages/Modules	Crates
Packages of Ruby programs and libraries	Packages of JavaScript programs and libraries	Packages of Rust programs and libraries
Gemfile	package.json	Cargo.toml
Specifies the gem dependencies for a Ruby project	Specifies the dependencies and scripts for a JavaScript project	Specifies the dependencies and configurations for a Rust project
Gemfile.lock	package-lock.json	Cargo.lock
Records the exact versions of gems installed	Records the exact versions of packages installed	Records the exact versions of crates installed
Rake	Gulp/Grunt	Cargo tasks
A build automation tool written in Ruby, similar to Make	Build automation tools for JavaScript	Integrated build automation in Cargo using commands like cargo build, cargo test, etc.

Default Behaviors

Ruby (Bundler)

• Default Install Location: vendor/bundle (when using bundle install --path vendor/bundle)
• Automatically installs missing gems listed in the Gemfile.
• Ensures all gem dependencies are met and consistent with the Gemfile.lock.
• Allows creating a consistent environment across different machines by using the same versions of gems.

JavaScript (npm)

• Default Install Location: node_modules
• Automatically installs all dependencies listed in the package.json.
• Ensures consistency across environments using package-lock.json by locking the dependency tree.
• Supports running scripts defined in the package.json for tasks like testing and building.

Rust (Cargo)

• Default Install Location: target directory for compiled outputs and .cargo/registry for downloaded crates.
• Automatically downloads and compiles dependencies listed in Cargo.toml.
• Ensures consistency across builds using Cargo.lock by locking the dependency tree.
• Provides built-in commands for building, testing, and running projects (cargo build, cargo test, cargo run).

Popular Version Managers

Ruby	JavaScript	Rust
RVM (Ruby Version Manager)	nvm (Node Version Manager)	rustup
rbenv	volta

Popular Packages and Equivalents

Functionality	Ruby (Gems)	JavaScript (Packages)	Rust (Crates)
Web Framework	Rails	Express	Rocket
Testing	RSpec	Jest	Cargo test
HTTP Client	Faraday	Axios	Reqwest
Authentication	Devise	Passport	jsonwebtoken
JSON Parsing	Oj	JSON (built-in)	serde_json
Database ORM	ActiveRecord	Sequelize	Diesel