Recap - Safe Unwrapping

Part of the Fundamentals section of Coddy's Swift journey — lesson 15 of 86.

Challenge

Easy

Write a function formatPlayerInfo that takes a player's name, score, and level as strings and returns a formatted player summary.

Use all three unwrapping techniques you've learned to handle potentially missing values:

Use guard let to check if the name is valid (non-empty). If the name is empty, return "Unknown player" immediately.
Use ?? (nil coalescing) to provide a default score of "0" if the score is empty.
Use if let to check if the level is valid (non-empty). If it has a value, include it in the output; otherwise, omit the level part.

Output Format:

If level is provided: "[name] - Score: [score], Level: [level]"
If level is empty: "[name] - Score: [score]"

Parameters:

name (String): Player's name (empty string represents nil)
score (String): Player's score (empty string represents nil)
level (String): Player's level (empty string represents nil)

Returns: A formatted string with the player's information, or "Unknown player" if the name is empty.

Hint: Convert empty strings to optionals inside your function by checking if they're empty and assigning nil if so.

Try it yourself

func formatPlayerInfo(name: String, score: String, level: String) -> String {
    // Write code here
}

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments

4Operators Part 1

Arithmetic Operators Modulo Operator Compound Assignment Recap - Simple Math Comparison Operators

7Basic IO

Print Function String Interpolation ReadLine Input Type Conversion Recap - Till 120 Recap - True or False

10Functions

Declare A Function Parameters And Arguments Return Values Argument Labels Recap - Sigma Function Recap - Validation Function Default Values

13Iterating Over Sequences

Iterating Over Elements The Enumerated Method Iterating Over Strings P1 Iterating Over Strings P2

16Final Challenges

Flat Asterisk Pyramid Pattern Finder What To Buy

2Variables

Let vs Var Type Annotations Numbers String Boolean Naming Conventions Recap - Initialize Variables

5Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Ternary Operator

8Bill Split Calculator

Welcome Message Getting Input

Calculating Tip And Total

Splitting The Bill

Formatted Output

11FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

14Arrays Advanced

Array Slicing Part 1 Array Slicing Part 2 Sequence Operators The Contains Method

3Optionals

What Are Optionals Unwrapping With If Let Guard Let Nil Coalescing OperatorRecap - Safe Unwrapping

6Decision Making

If Statement If - Else Recap - Simple Calculator Switch Statement Switch With Ranges

9Loops

For-In Loop While Loop Repeat-While Loop Break Continue Recap - Factorial Ranges In Loops Nested Loop Recap - Dynamic Input

12Arrays Basics

Declaring An Array Accessing Elements Modifying Arrays Array Methods Recap - Product List Recap - Reversed Array Tuples

15Daily Expense Tracker

Project Overview Exit The Program