vinkrish

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

vinkrish

>git help
usage: git [--version] [--help] [-C <path>] [-c name=value]
           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
           [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]
           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
           <command> [<args>]

These are common Git commands used in various situations:

start a working area (see also: git help tutorial)

vinkrish

Android Studio:
Ctrl + Alt + L
Ctrl + Alt + I

Eclipse:
Ctrl + I
Ctrl + Shift + F

Sublime: 
HTML / CSS / JS : Ctrl + Shift + H

vinkrish

PascalCase 
camelCase.
snake_case.
lisp-case (or) spinal-case (or) train-case (or) kebab case: some-name.

vinkrish

npm update -g typescript
tsc -v

To check app version:
ng -v

npm install -g @angular/cli
ng new first-app
cd first-app
ng serve --open

vinkrish

#
#   Contents
#
#  1. JSON Documents
#  2. CRUD - Create / Read / Update / Delete
#     a. Create
#       - Different ways to insert/create an index
#       - Bulk indexing documents
#     b. Read
#       - Basic searches

vinkrish

# Comment
{
  graphQLHub
  github {
    // Object Field
    user(username: "clayallsopp") { // username is Field arguments
      login // Scalar Field
      id
      avatar_url
    }

vinkrish

query TestQuery {
  graphQLHub
  github {
    user(username:"vinkrish") {
      id
      company
      avatar_url
      repos {
        name
      }

vinkrish

cd C:\Program Files\PostgreSQL\11\bin
createuser -U postgres -s YOURUSERNAME
createdb YOURUSERNAME

vinkrish

// For example (functions.js):

module.exports = {
   func1,
   func2
}
// is included in your file:

const { func1, func2 } = require('./functions')
// Now you can call them individually,