Ruby is not just a programming language, but an entire philosophy about programming. It makes programming fun, productive, and rewarding. Most programs consist of code that needs to be organized into functions. And so most Ruby programs consist of classes and modules containing useful functions for interacting with the real world, operating on text, working with objects, creating GUIs, doing system administration tasks, building web applications… you name it. Ruby is at its heart a toolkit for accessing existing libraries like OpenSSL and providing something like Visual Basic style syntactic sugar to make working with them fun.
Bundler is a gem that helps you manage an application's gem dependencies. It works by installing all gems required for your application in your project's bundler environment. The default behavior is to bundle gems into a vendor/bundle directory within your app. There are many ways to customize the way gems are installed using Bundler. For example, you can install gems directly into your app, but keep them up-to-date with Bundler by changing your bundle specification. This may be useful if you want to share the same Gemfile between projects, but also wanted some flexibility on where certain gems are installed or store
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