- Javascript
- Objects
- Basics
- Reference
- Methods
- Constructor
- Fundamentals
- Hello World
- Code Structure
- Use Strict
- Variables
- Data Types
- Type Conversions
- Maths
- Comparitions
- Conditional
- Loops
- Functions
- Testing
- Mocha
- Nested Describe
- Types
- Primitives ♣
- Numbers
- Strings
- Arrays
- Json
- Design Pattern
- Observer Pattern
- Classes
- Constructor
- Binding
- Inheritance
Objects
Objects are heavier than primitives.
/**
* One of the best things about objects is that ...
* we can store a function as one of its properties
* But that come with a cost ...
* Objects are heavier than primitives
*/
let user = {
name: 'John',
message: () => console.log("Hello World"),
}
user.message(); // Hello World
Wrappers
Object wrappers allow us to access primitives using methods.
/**
* Object wrappers for each primitive type:
* String, Number, Boolean, etc
* Primitives can provide methods and still remain lightweight
*/
let a = 'Hello World'; // Wrapper called
let b = a.toUpperCase(); // Object a destroyed, primitive remains
let c = 1.23456; // Wrapper called
let d = c.toFixed(2);
console.log(b); // HELLO WORLD
console.log(n2); // 1.23
Last update: 61 days ago
