Author: onoumenon

path module in node.js path.basename, dirname, issues w delimiters console.log(path.join(dirname, ‘test’, ‘hello.html’)) fs (filesystem) mkdir(), writeFile(), appendFile(), readFile() os (op sys) .plaform(), cpus(), freemem() url new URL events use for logger middleware http createServer()

CRUD note: __v is versioning, only updates on .save() .save(), .find(), .where, findByIdAndUpdate(), findOneAndDelete() Queries are Not Promises Mongoose queries are not promises. They have a .then() function for co and async/await as a convenience. However, unlike promises, calling a query’s .then() can execute the query multiple times. Testing CRUD Schema Validation validates only on .save() for the rest of the methods, set runValidatorsoption to … Continue reading JumpStart – CRUD, Testing CRUD

CLI && vs & (in shell) && ( waits for first condition is true) & (parallel process, runs both whether first condition passes) to set up env var for both windows and unix you can use cross-env there’s also another utility for env var to wait-on command to be finished npm-run-all CLI tool to run multiple … Continue reading JumpStart – History of CI, Intro to MongoDB

Client -> sends (origin: yourwebsite.netlify.com) -> CORS –> Books API (server) –> ACAO (Access-Control-Allow-Origin) –> If ACAO, SUCCESS! IMPORTANT! Insomnia does not give CORS error presentation: hasCorrectAttributes (jest) filter results: .some(), .every() pull request fork, edit and commit in new branch -> create pull request –> create issue (paste in #of pr in write) backtick … Continue reading JumpStart – sending ACAO and CI using travis CI

put/ patch (implementation is up to server) Supertest uses superagent to use html methods (.post, .query({format:’json’}) Using jest expect (green indicates jest expect): .expect(202) .then(res => { expect(res.body.id).toEqual(expect.any(String)); expect(res.body.name).toEqual(“Alfred”); expect(res.body.subjects).toEqual(expect.any(Array)); }); versioning exists in api app.use(“/app/v1….”) For… in loops over prototype chain as well (eg: objects constructed from class) so use Object.entries [[k,v], [k,v]] Object.keys … Continue reading JumpStart – Testing our Express server (supertest)

  Insomnia has an environment you can set baseurl and port also sub environments MIDDLEWARE express has a built-in body-parser: express.json uses body-parser as middleware and support lotsa other middleware https://expressjs.com/en/resources/middleware.html each packet contains: header, data, checksum https://en.wikipedia.org/wiki/Transmission_Control_Protocol express doesn’t know how to read the body content so the header informs it of the content … Continue reading JumpStart – Building an Express server

RPC vs RESTful (remote protocol call vs respresentational state) (function driven vs resource driven) eg: example.com/createStudents vs example.com/students .fetch() does not treat status code ‘errors’ (400s, 500s) as an error axios.get() catches status code ‘errors’ CORS Cross-origin (includes different subdomains) to prevent malicious websites from cross origins, client can send the OPTIONS request with Origin: … Continue reading JumpStart – Intro on Creating your on RESTFUL API

CRUD – Create Read Update Delete CORS (Cross Origin Resource Sharing) API TOKEN – public, private DARPA – US military Project Internet TCP/IP — Internet Protocol Suite (eg HTTP, IMAP (mail), SSH, etc) WWW – HTTP W3W WHATWG TCP – reliable, UDP – less reliable (video stream) IPV4 – IPV6 (more numbers in V6) HTTPS … Continue reading JumpStart – Intro to the Web

Axios 3rd Party Lib larger size lots of helper methods OK error handling Fetch API Built in to browser smaller size write everything yourself weird error handlingcreate-react-app comes with dotenv module Please do this to hide your API key (in prod, this can be added to the site env variables): create a .env.local file for … Continue reading JumpStart – React Fetching Data

This is a continuation of yesterday’s post on React. As today’s lesson is a lab (code-along), the post will not be comprehensive. Form Validation using Joi: Joi-browser import joi from “joi-broswer” schema = {   _id:Joi.string(),     .integer()     .min(1)     .required(),   imageUrl:Joi.string()   .uri({     relativeOnly:true   })   … Continue reading JumpStart – React form Validation and getting data when component is mounted