Dmitry Ruban

Posted on Apr 23, 2023

Web-Essentials Reminder

#webdev #javascript #interview #beginners

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

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