/Algorithm-Coding-Pool

A website that collect my answer to Algorithm coding problems

Primary LanguageJavaScriptMIT LicenseMIT

Algorithm-Coding-Pool

A website that collect my answer to Algorithm coding problems

Modeling

default object is mongoose model, & is reference to mongoose schema objectID, [] is array object

Root
→ answer - content
→ code - content
- language
- result
- performance
→ description - title
- brief
- serialNum
- solved
- difficulty
→ solution - & answer
- & code
→ question - solutions: [& solution]
- & description

View

Adopt frontend framework angular as user interface to interact with this service, https://github.com/Alex-Lin5/CodingWeb

Environment

Configuration

  • Docker compose file set up NODE_ENV variable value in containers
  • database directory is refered from /config/*.json file

CORS policy

Refer to CORS document here in Mozilla

Mongo Service

Type mongo in terminal to enter mongodb shell

  • show dbs, list all databases in current connection
  • db, return current working database
  • use pool, change current working database to pool
  • show collections, list all collections in current working database
  • db.collection.find(), list all items in this collection
  • More CRUD operations can be found in mongoDB manual
  • https://www.mongodb.com/docs/mongodb-shell/run-commands/

Note

Environment Variable Declaration

For Windows powershell

  • echo $env:NODE_ENV, to get the value
  • $env:NODE_ENV="production", to set a value

Docker usage

  • docker exec -it 'ID' sh, interact the container of specific ID with shell
  • docker-compose up --build, rebuild and start up the docker services

NPM package management

  • npm outdated, list all packages available to update
  • npm update, updates all packages available to update
  • npm i -g npm-check-updates, globally install ncu package to manege update
    • ncu -u, upgrade all packages in repository to latest version
  • npm list -g --depth=0, list all globally installed packages without its dependencies

Mongo ObjectID

The 12-byte ObjectId consists of:

  • A 4-byte timestamp, representing the ObjectId's creation, measured in seconds since the Unix epoch.
  • A 5-byte random value generated once per process. This random value is unique to the machine and process.
  • A 3-byte incrementing counter, initialized to a random value.

While the BSON format itself is little-endian, the timestamp and counter values are big-endian, the most significant bytes appear first in the byte sequence.

If an integer value is used to create an ObjectId, the integer replaces the timestamp.

https://www.mongodb.com/docs/manual/reference/method/ObjectId/

Bugs

  • Middleware authorization test failed on 401 and 400. Invalid token or null token does not fail the authorization process as getting user profile. Auth middleware is injected in user routing for GET /me/:id http request.