global objects notes

Author: gambitier

session 3/chapters/3. Node features.md

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+# Global Objects
+
+In browsers, the top-level scope is the global scope. That means that in browsers if you're in the global scope var something will define a global variable. In Node.JS this is different. The top-level scope is not the global scope; `var something` inside a Node.JS module will be local to that module.
+
+Node. js global objects are global in nature and they are available in all modules. We do not need to include these objects in our application, rather we can use them directly. These objects are modules, functions, strings and object itself.
+
+There are built-in objects that are part of the JavaScript language itself, which are also globally accessible. [refer them here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects) and [here](https://nodejs.org/api/globals.html#global-objects)
+
+The following variables may appear to be global but are not.
+
+```
+__dirname
+__filename
+exports
+module
+require()
+```