Arrays

Relax. We'll talk through this in plain words — no textbook voice.

Array is a collection that stores data of the same type in order. You can use arrays to store things like product lists, menu items, todo tasks, or lesson titles. Array indexes start at 0.

swift

var lessons = ["Intro", "Variables", "Arrays"]

print(lessons[0])

lessons.append("Functions")

for lesson in lessons {
    print("Lesson: \(lesson)")
}

print("Total lessons: \(lessons.count)")

lessons[0] grabs the very first item. append() adds a new item, and a for-in loop walks through each item in the array.

You should see

Intro Lesson: Intro Lesson: Variables Lesson: Arrays Lesson: Functions Total lessons: 4

Easy traps

If an array only has 3 items, lessons[3] is actually the fourth item. lessons[4] would go out of range.