Modules

Question 1

What are modules?

Answer 1

Modules are reusable pieces of code that can be exported from one program and imported for use in another program.

Question 2

What are the steps to create/export a module? With these steps in mind, write an example of an object and then export it a module.

Answer 2

1. Define an object to represent the module
2. Add data or behavior to the module
3. Export the module, like so: module.exports = Menu;

let Airplane = {};
Airplane.myAirplane = 'Starjet';
module.exports = Airplane;

Question 3

How would you require this Airplane module in order to include in a function that logs the property to the console?

Answer 3

const Airplane = require(‘./1-airplane.js’);

const displayAirplane = () => {
console.log(Airplane.myAirplane);
}
displayAirplane();

Question 4

Create an empty object and then assign a property with a value when you export it.

Answer 4

const Airplane = {};
module.exports = {
myAirplane: 'CloudJet',
displayAirplane ()function {
return this.myAirplane;
}
};

Question 5

There are two new more readale/easier ways to export a module, what are these two and write an example for each. How would you import if you used the named export method?

Answer 5

The two way are default exports and named exports.

default export:
let Menu = {};
export default Menu;

named export:
export {availableAirplanes, flightRequirements, meetsStaffRequirements};

named import:
import {availableAirplanes, flightRequirements, meetsStaffRequirements} from ‘./airplane’;

Question 6

How could you export a named export? So modify the following lines of code.

let specialty = '';
function isVegetarian() {
}; 
function isLowSodium() {
};

Answer 6

export let specialty = '';
export function isVegetarian() {
}; 
export function isLowSodium() {
};

Question 7

When exporting a module, you can export it as a different name, export the following:

let specialty = '';
function isVegetarian() {
}; 
function isLowSodium() {
};

as different names

Answer 7

let specialty = '';
function isVegetarian() {
}; 
function isLowSodium() {
};

export {speciality as specials, isVegetarian as isVeg, isLowSodium as isLowSod}