Swift Reduce Explained | (Higher Order function) |

Swift Reduce Explained | (Higher Order function) | #iosinterview #swiftprogramming
In this video, we deep dive into Swift’s reduce higher-order function and understand how it works internally by building a custom reduce() from scratch.

If map transforms values and filter selects values, then reduce combines multiple values into a single result — and this concept is extremely important for iOS interviews, functional programming, and writing clean Swift code.

🔍 What you’ll learn in this video:

What reduce is and why it exists

How reduce works step-by-step

Understanding the accumulator concept

How closures work inside reduce

Generic signature of reduce

Difference between map, filter, and reduce

How to build a custom reduce function

Real-world examples (sum, combine, transform)

Common mistakes developers make with reduce

Interview-ready mental model for reduce

🧠 Why this video matters:

Many developers use reduce but don’t truly understand how it works internally.
In interviews, this is often tested by:

Asking you to explain reduce

Writing a custom reduce implementation

Comparing it with map & filter

Explaining closures, generics, and accumulation

After this video, you’ll be able to confidently explain and implement reduce like a senior iOS developer.

📚 Part of Higher-Order Functions Series:

Swift Map — How It Works

Swift Filter — How It Works

Swift Reduce — How It Works (This Video)

👉 Watch the full playlist to master functional programming in Swift.
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