async-functions

Promises

Sandbox

Read a file

• require const fsPromises = require('fs').promises;
• use fsPromises.readFile to read a file
• then console.log the file

Write a file

• require const fsPromises = require('fs').promises;
• use fsPromises.writeFile to write a file
• then console.log "DONE!"

Copy a file

• require const fsPromises = require('fs').promises;
• use fsPromises.readFile to read a file
• then use fsPromises.writeFile to write the read data
• then console.log "DONE!"

Copy a file

• create and export a copy(src, dst) function
  • require const fsPromises = require('fs').promises;
  • use fsPromises.readFile to read a file
  • then use fsPromises.writeFile to write the read data
  • return the promise
• test
  • test your copy function
  • invoke your copy function
  • then expect that the new file exists
  • make sure to clean up copied files in an afterAll or afterEach

Transformer

• create and export a transform(src) function
  • require const fsPromises = require('fs').promises;
  • use fsPromises.readFile to read a file
  • then remove all capital letters
  • then make all letters capital
  • then reverse the string
• test
  • invoke your transform function
  • then expect that the result is what you think it should be

Sandbox

node-fetch

Use the Futurama Quote API http://futuramaapi.herokuapp.com

• use fetch to make a request to http://futuramaapi.herokuapp.com/api/quotes/1
• use then to wait for the request to resolve and parse json
• then print the output
• How would you get more than 1 quote?
• How would you get only quotes by Bender?

node-fetch Again

• use fetch to make a request to https://rickandmortyapi.com/api/character/
• use then to wait for the request to resolve and parse json
• then print the output

Promise.all

• use fetch to make a request to https://rickandmortyapi.com/api/character/
• use then to wait for the request to resolve and parse json
• then make another request to retrieve the origin of each character
  • HINT: use Promise.all

write a service

• write a rickAndMortyApi.js and rickAndMortyApi.test.js file
• export a function getCharacter that takes an id and returns a promise that resolves to a character
  • return only the characters name, status, and species
• WRITE YOUR TESTS FIRST

write a service async/await

• refactor your getCharacter function to use async/await
• your tests should still pass without any edits

write a get many service

• export a function getManyCharacters that takes an array of ids and returns a promise that resolves with an array of characters
  • use your getCharacters function from before with a Promise.all
• WRITE YOUR TESTS FIRST

write a get many service with async/await

• refactor your getManyCharacters function to use async/await
• your tests should still pass without any edits

Rubric

• 2 points for copy function
• 2 point for transform
• 2 points for getCharacter function
• 3 points for getManyCharacters function
• 1 point for mocks