Web-Essentials Reminder

This is a simple reminder to help refresh your knowledge or prepare for a Junior position interview.

JavaScript Engine

• Data Types
  • number: for any kind of numbers, integer or floating-point.
  • string: for strings. A string may have one or more characters; there’s no separate single-character type.
  • boolean: for true/false values.
  • null: for unknown values – a standalone type with a single value null.
  • undefined: for unassigned values – a standalone type with a single value undefined.
  • object: for more complex data structures.
  • symbol: for unique identifiers. Learn more
• Boxing/Unboxing: Learn more
• Variables: const, let, and var. Learn more about const, Learn more about var
• Closures: MDN, JavaScript.info, Medium
• Arrow functions vs regular functions: Vinta, MDN
• Objects: Learn more
• Prototypes: JavaScript.info (Inheritance), JavaScript.info (Function Prototype)
• Property flags and descriptors: Learn more - value, writable, enumerable, configurable
• Decorators: TypeScript Documentation
• Generators (yield): Learn more
• Promises: Learn more
• Memory allocation: Learn more

TypeScript

• Basic concepts

Node.js

• Overview
• Dependencies and npm
• Event loop: Learn more
• Streams: Medium, YouTube, freeCodeCamp
• Google V8 and Libuv
• Garbage collector: Learn more
• Pros and cons of Node.js
• Express and other frameworks

Browser

• Web APIs, JavaScript runtime, browser event loop, and browser promises: ITNEXT (1), ITNEXT (2)
• Web Workers
• Document Object Model (DOM)
• Virtual DOM: React.js Documentation, Habr (Russian)
• Shadow DOM: Learn more

SQL

• Database design
• Indexes
• N + 1 problem
• Joins
• ACID properties

NoSQL

• Overview
• Sharding
• Comparing with SQL databases
• CAP theorem: Wikipedia, Quora

REST API

• Overview
• API design
• Examples
• Bulk operations

Authentication and Authorization

• Cookies
• Session
• LocalStorage
• JWT
• OAuth 2

HTTPS

• Protocol
• Methods & Status codes
• Limitations

Testing

• Behavior-Driven Development (BDD)
• Test-Driven Development (TDD)

Object-Oriented Programming (OOP)

• Fundamentals
• Examples
• SOLID principles
• Design patterns

Build tools and preprocessors

• Webpack
• Sass
• Less