Creating a Javascript Module

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First We Create a Module

myModule.js

This contains one private function rndInt and one public (exported) function rndColor.

I have also included a check with code which will run when myModule.js is run directly. This might be useful for unit tests in the module (not sure).

const rndInt = (max) => Math.floor(Math.random() * max) + 1;

exports.rndColor = () => '#' + (rndInt(256)-1).toString(16) +
    (rndInt(256)-1).toString(16) + (rndInt(256)-1).toString(16);

if (process.argv[1].match(/myModule.js$/g)) {
  console.log('myModule run directly');
}

Second We Use the Module

myProgram.js

const m = require('./myModule');

console.log(m.rndColor());

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