Node.js Dot Notation as Namespace Mechanism

In node.js, when you have a dot notation like

x.y

the x is used purely as a namespace, not as “data”.

Example:

const p = require("path");
const x = p.extname("xyz.html");
console.log(x);
// .html

This is true for about all node.js objects.

This is interesting because the item before the dot is usually considered as a object that represent a piece of data in Object Oriented Programing languages. For example, in JavaScript:

" x ".trim()