32. Exploring Modules & The NPM Universe

 

323. Working With module.exports

 

./math.js

 

module.exports = {
    add: (a, b) => a + b,
    PI: 3.14159
}

 

./app.js

 

const { add, PI } = require('./math')

console.log(add(2, 4));
console.log(PI);

 

 

324. Requiring A Directory

 

When requiring a directory, index.js file will be used in Node

 

 

325. Introducing NPM

 

NPM

 

- Node Package Manager

 

- A library of thousands of packages published by other developers that we can use for free

 

- A command-line tool to easily install and manage those packages in our Node projects

 

 

328. The All-important Package json

 

package.json

 

- A JSON file that has metadata about a package.

 

- It saves the author, license. dependencies, etc.

 

- "npm init" command to create a package.json file

 

 

 

329. Installing All Dependencies For A Project

 

- "npm install" command in a folder having a package.json file will install all dependencies enumerated in the package.json file automatically