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Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

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Git Command Workflow Sequence Diagram

%% https://mermaid.js.org/syntax/sequenceDiagram.html#styling
%% It would be cool to add sequences to the top from the column names
%%{
  init: {
	"theme": "base",
	"sequence": {
	  "actorFontFamily": "monospace",

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Real-world App & Preferred Database

Real-World Application Type	Preferred Main Database	Reasoning
Blockchain Analytics	PostgreSQL	Requires strong ACID properties for integrity and detailed relational queries for analysis.
Chat/Messaging Application	MongoDB	Flexible schema for fast-changing message formats, handles high volumes of small, write-heavy data.
Content Management System (CMS)	MongoDB	Supports complex, nested document storage; handles unstructured or se

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Pros of Default Exports:

1. Simple Syntax for Single Exports:

   • For files that export only one function, class, or object, default exports offer a simple and concise syntax: export default MyClass or export default myFunction().
   • This allows direct, clean import statements: import MyClass from './MyClass', reducing verbosity when working with a single, obvious export.

2. Convenient for Dynamic Imports:

   • Default exports integrate relatively cleanly with import() for dynamic imports, although there are naming challenges (see cons).

Cons and Downsides of Default Exports:

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License	Permissions	Consequences	Features	Use Cases
Apache License 2.0	Allows commercial use, modification, distribution, patent use, private use	Must include license and copyright notice, state changes	Patent license, trademark use prohibited	Large-scale, commercial software projects
GNU GPL v3.0	Allows commercial use, modification, distribution, patent use, private use	Must disclose source, include license and copyright notice, state changes, same license	Strong copyleft, patent license, anti-circumvention provision	Free software projects, ensuring derivative works remain open source
MIT License	Allows commercial use, modification, distribution, private use	Must include license and copyright notice	Very permissive, short and simple	Small projects, libraries, or any software where you want minimal restrictions
BSD 2-Clause	Allows commercial use, modification, distribution, private use	Must in

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Про токены, JSON Web Tokens (JWT), аутентификацию и авторизацию. Token-Based Authentication

Last major update: 25.08.2020

• Что такое авторизация/аутентификация
• Где хранить токены
• Как ставить куки ?
• Процесс логина
• Процесс рефреш токенов
• Кража токенов/Механизм контроля токенов

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defaults:

• npm config set init-author-name ""
• npm config set init-author-url ""
• npm config set init-author-email ""
• npm config set init-license "ISC"
• npm config set init-version "1.0.0"

custom (example)

• npm config set init-author-name "Tierney Cyren"
• npm config set init-author-url "https://bnb.im"

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Member in object

Check whether a certain method or property (typically an entry point into using the API or other feature you are detecting for) exists in its parent Object

Check if a certain property exists on a global object (such as window or navigator)

if("geolocation" in navigator) { ... }

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Value	Operator	Description	Example
19	( )	Expression grouping	(3 + 4)
18	.	Member	person.name
18	[]	Member	person["name"]
17	()	Function call	myFunction()
17	new	Create	new Date()
16	++	Postfix Increment	i++
16	--	Postfix Decrement	i--
15	++	Prefix Increment	++i

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// ArrayScript...or as I would have nothing to do

let testSuite = [
    'Awesome',
    'epic fail',
    'remember,remember',
    'to be or not to be...',
    'DealerPoint is awesome...',
    'The best code is the one that doesn`t exist...',
    'Whatever the mind can conceive and believe, the mind can achieve. — Napoleon Hill',