Lesson 5Swift Basics

Print & Debug

Printing and Debugging

The print() function is your best friend for understanding what your code is doing!

String Interpolation

Use \(variable) to insert values into strings:

print("Hello, \(name)!")

Debugging Tips

Print variables to see their current values
Add labels to your print statements
Track program flow by printing at key points
Use dump() for complex objects

Advanced Print Options

separator

Custom separator between items

print(1, 2, 3, separator: "-")

terminator

What comes after (default: newline)

print("Hi", terminator: "")

main.swift

// Basic print
print("Hello!")
print("Welcome to Swift!")

// String interpolation - insert values into strings
let name = "Alex"
let age = 12
print("My name is \(name)")
print("I am \(age) years old")
print("\(name) is \(age) years old")

// Math in interpolation
let a = 5
let b = 3
print("\(a) + \(b) = \(a + b)")

// Debugging with print
var score = 0
print("Starting score: \(score)")
score += 10
print("After bonus: \(score)")
score *= 2
print("After multiplier: \(score)")

// Print multiple items with separator
print("A", "B", "C", separator: "-")  // A-B-C

// Print without newline
print("Loading", terminator: "")
print("...")  // Loading...

// Debug with dump() for detailed info
let numbers = [1, 2, 3]
dump(numbers)

Try It Yourself!

Use string interpolation to print a sentence about yourself: name, age, and favorite color. Use print statements to track a score through multiple changes!