README.md

JS Object Literals

An object is a collection of key-value pairs (properties) where keys are strings (or Symbols) and values can be any data type, including other objects, arrays, or functions.

Objects are collection of properties

const objectName = {
    key1: value1,
    key2: value2,
    key3: value3
};

Object References and const

When you create an object, the variable stores a reference (memory address) to the object, not the object itself. const locks this reference, but the object's internal properties remain mutable.

// Two variables can reference the same object
const obj1 = { name: "John" };
const obj2 = obj1;  // Both point to SAME object in memory

obj2.name = "Jane";

console.log(obj1.name);  // "Jane" (changed!)
console.log(obj1 === obj2);  // true (same reference)

const person = { name: "Alice", age: 25 };

// CAN change internal properties
person.age = 26;           // Allowed
person.city = "NYC";       // Allowed
delete person.name;        // Allowed

// CANNOT change the reference
person = { name: "Bob" };  // TypeError!
person = null;             // TypeError!
person = {};               // TypeError!

Math Object

Properties:

• Math.PI - 3.14159...
• Math.E - 2.718...

Methods:

• Math.abs(n) - Absolute value (removes negative sign)
• Math.pow(a,b) - a to the power of b
• Math.floor(n) - Round down
• Math.ceil(n) - Round up
• Math.random() - Random 0 to 1 (excludes 1)
• Math.trunc(n) - Removes decimals