The Coding Challenge Playbook: Using Loops and Dictionaries

Practical Swift Challenges with Dictionary Methods

What you'll learn
Apply the dictionary initialization method to count occurrences and track data patterns in arrays and strings.
Use for loops with continue statements to control flow and skip unnecessary iterations in coding challenges.
Recognize when to apply dictionary-based solutions to problems involving frequency, grouping, and validation.
Solve real-world Swift challenges by combining loop logic with conditionals and dictionary state tracking.
Break complex problems into repeatable logic patterns using structured iteration and conditional branching.
Create frequency maps, reverse lookup dictionaries, and grouped collections using foundational Swift syntax.
Debug and test dictionary-driven logic with predictable control flow using repeatable code patterns.
Differentiate between problems that require counting, filtering, or grouping — and apply the correct structure.
Write clean, reusable Swift functions that apply dictionary and loop logic to a wide range of algorithmic tasks.
Build confidence in solving interview-style problems through disciplined practice with structured logic patterns.

Requirements
Basic understanding of Swift syntax and data types (e.g., Int, String, Array, Dictionary).
Familiarity with using for-in loops in Swift.
Ability to write simple functions using func in Swift.
Basic comfort with if/else conditional logic.
Experience running and testing Swift code in Xcode, Playgrounds, or an online Swift environment.
Understanding of zero-based indexing and how to access array elements.
Knowledge of Swift optionals and how to unwrap values using if let (helpful but not strictly required).
Comfort reading and modifying small code snippets.
Interest in solving algorithmic or logic-based coding problems.
No prior experience with advanced algorithms or data structures is required — this course focuses on mastering patterns, not complexity.

Description
This course is designed for iOS developers who want to sharpen their core programming logic through a targeted, pattern-driven approach to solving coding challenges. Rather than jumping between unrelated problems, this course focuses on mastering two powerful Swift tools: the for-each loop with continue control flow and the dictionary initialization method.Through a carefully curated series of challenge problems, students will learn to identify situations where these patterns apply, and build the discipline of solving problems through a consistent system of repeatable steps. By doing so, they will develop a reusable mental framework for handling common categories of algorithmic problems—such as frequency counting, grouping, filtering, and structural comparison.This course emphasizes clarity, repetition, and intentional constraint: instead of covering every possible Swift feature, it focuses on building strength in just two patterns that appear over and over again in real-world logic and technical interviews.Students will complete challenges like:Counting duplicates in arraysGrouping items by character or numberDetecting when a string or array meets specific frequency-based conditionsBuilding logic flows that skip, accumulate, and selectively build dictionaries through iterationWhether you're preparing for coding interviews, building problem-solving confidence, or reinforcing your command of Swift fundamentals, this course gives you a structured, repeatable system for beating coding challenges with discipline and precision.

Who this course is for
Beginner iOS developers looking to improve their problem-solving skills in Swift.
Self-taught Swift learners who want to deepen their understanding of core control structures and dictionary logic.
Students preparing for technical interviews or coding challenges in Swift.
Developers transitioning into iOS who want a structured way to practice Swift fundamentals.
Programmers who feel stuck on logic-based problems and want a repeatable system to approach them.
Swift developers who want to master the use of for loops, continue, and dictionary patterns in real coding scenarios.
Bootcamp students or recent graduates who want to reinforce key programming patterns with focused repetition.
Educators or mentors looking for structured exercises to teach Swift logic and iteration.
Mobile app developers who want to write more expressive, testable, and readable code using Swift collections.
Anyone who wants to gain fluency in writing clean Swift logic using minimal but powerful tools.