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32.1: Modules: sharing or accessing JavaScript code - Coggle Diagram

32.1: Modules: sharing or accessing JavaScript code

making your own module

math.js

const add = (x, y) => x + y;

const PI = 3.14159;

const square = x => x * x;

the contents of a file

examples

setting to "HELLO!"

exporting what we've defined

math.js

...
module.exports.add = add;
module.exports.PI = PI;
module.exports.square = square;

> node app.js

outputs

> { add: [Function: add], 
    PI: 3.14159, 
    square: [Function: square] }

shorter syntaxes

...
const math = {
  add: add,
  PI: PI,
  square: square,
};

module.exports = math;

index.js

can be used

example

directory structure

files

barney.js

module.exports = {
  name: "Barney",
  colour: "fawn and white",
  description: "baby hippo"
}

fred.js

module.exports = {
  name: "Fred",
  colour: "tan and white",
  description: "lioness"
}

index.js

const fred = require("./fred");
const barney = require("./barney");

const dogs = [fred, barney];
console.log(dogs);

> node index.js

outputs

> [
  { name: 'Fred', ... },
  { name: 'Barney', ...'}
]

/dogs
 - barney.js       
 - fred.js         
 - index.js