Arrays & Objects

Arrays are like ordered lists or containers that can hold multiple values. Think of them as a row of numbered boxes, where each box can store something different.

Real-world analogies:

• •A shopping list (items in order)
• •A line of people (first person, second person, etc.)
• •A playlist (song 1, song 2, song 3...)

Creating arrays:

const numbers = [10, 20, 30, 40];

const fruits = ["apple", "banana", "orange"];

const mixed = [42, "hello", true, null]; // Can mix types!

Accessing array items:

• •Arrays start counting at 0 (not 1!)
• •
  First item:arr[0]
• •
  Second item:arr[1]
• •
  Last item:arr[arr.length - 1]

Example:

const colors = ["red", "green", "blue"];

console.log(colors[0]);    // "red" (first)

console.log(colors[2]);    // "blue" (third)

console.log(colors.length); // 3 (total items)

Why arrays are useful:

• •Store multiple related values together
• •Process lists of data efficiently
• •Keep things in order
• •Perfect for collections of similar items