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Swift Programming

Arrays Series · Lesson 2

Arrays: Programming Tutorial

Follow a practical coding walkthrough for creating, reading, and updating arrays in Swift.

Swift Programming Xcode iOS

What to focus on while watching

  • Practice creating arrays with clear type declarations.
  • Use indexing and common methods to read and update elements.
  • Understand how array operations connect to real app logic.
Part 1: Conceptual Understanding Back to Arrays Module

Lesson Notes and Walkthrough

This lesson moves from concept to code. You will practice the most common array operations: creating, reading, appending, and removing values.

Core Operations

  • Create: start with a list of values.
  • Read: access an item using an index.
  • Update: change a value at a specific index.
  • Append/Remove: add or delete items as data changes.

Step-by-Step Example

var tasks = ["Study Swift", "Build App"]

tasks.append("Review Notes")   // add item
tasks[0] = "Study Arrays"      // update first item
tasks.remove(at: 1)            // remove second item

print(tasks)

Expected Output

["Study Arrays", "Review Notes"]

How to Debug Array Code

  1. Print the array after each major step.
  2. Check array.count before using indexes.
  3. Use clear names like tasks, scores, cities.

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Series| Part 1

Practice: Array Operations

~8 min Beginner

Goal: Add, remove, and read items from a Swift array.

Steps

  1. Create an array with two fruits.
  2. Append one item and remove one item.
  3. Print the final array and item count.

Expected Output

["apple", "orange"]
Count: 2
Need a hint? Use append to add and remove(at:) to remove.

Code

import Foundation

var fruits = ["apple", "banana"]
fruits.append("orange")
fruits.remove(at: 1)

print(fruits)
print("Count: \(fruits.count)")
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