Arrays & Collections

Arrays in JSON represent ordered lists of values. They're essential for handling collections of data.

Array Basics

Arrays use square brackets [] and can contain any JSON values:

["apple", "banana", "cherry"]
[1, 2, 3, 4, 5]
[true, false, true]
[{"id": 1}, {"id": 2}]

Accessing Array Elements

Arrays are zero-indexed - the first element is at index 0:

Arrays of Objects

The most common pattern - arrays containing objects:

Nested Arrays

Arrays can contain other arrays:

Exercise: Access Array Element

Exercise: Get Array Length

Exercise: Access Last Element

Key Points

• Arrays are ordered, zero-indexed collections
• Use [index] to access elements
• .length gives you the array size
• Arrays commonly contain objects
• Nested arrays use chained brackets: arr[0][1]