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The Coding Challenge Playbook: Using Loops and Dictionaries
Rating: 5.0 out of 5(1 rating)
636 students

The Coding Challenge Playbook: Using Loops and Dictionaries

Practical Swift Challenges with Dictionary Methods
Created byNorbert Grover
Last updated 10/2025
English

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.

Course content

3 sections • 25 lectures • 3h 24m total length

  • Introduction: Why You Need a System to Solve Coding Challenges0:49

    This lecture explains why this course material is important and what the course will help you with.

  • Imperative vs Declarative Functions: Two Ways to Tell the Computer What to Do1:12

    This lecture explains declarative versus imperative functions and why you would use one over the other. Throughout the course, I will be comparing and contrasting declarative vs imperative solution.

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 arrays

  • Grouping items by character or number

  • Detecting when a string or array meets specific frequency-based conditions

  • Building logic flows that skip, accumulate, and selectively build dictionaries through iteration

Whether 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.

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