Uploaded February 2023 | Updated September 2026, 1 week ago
Go to squarespace.com/seanallen to save 10% off your first purchase of a website or domain using code SEANALLEN.
Explaining Filter, Map and Reduce in Swift is a very common iOS Dev interview question. In this tutorial I'll walk you through how Filter, Map and Reduce work and how to chain them together for more complex examples. I also show you how compact map and flat map work.
This tutorial was created using Xcode 14 and iOS 16.
iOS Developer Interview Questions Playlist:
youtube.com/playlist?list=PL8seg1JPkqgF5wazzCKSq3EEfqt3t8mvA
My iOS Dev Courses:
seanallen.teachable.com/?video=-mx_Kf3qKJY
My Closures Video:
youtu.be/ND44vQ5iJyc
Twitter:
Sean Allen - twitter.com/seanallen_dev
Hired.com:
hired.com/x/1n01g
Book and learning recommendations that help out the channel if you decide to purchase (Affiliate Links):
Paul Hudson's Hacking With Swift:
gumroad.com/a/762098803
Donny Wals - Combine:
gumroad.com/a/909014131
Mark Moeyken’s SwiftUI Books:
bigmountainstudio.com/swiftui-views-book/fzc51
Objc.io Books (Thinking in SwiftUI & Advanced Swift):
gumroad.com/a/656585843
#swift #softwaredeveloper #iosdeveloper
Timestamps:
0:00 - Filter, Map, Reduce
0:45 - Filter
3:02 - Map
4:35 - Reduce (simple)
6:05 - Reduce (on property)
7:17 - Chaining
10:18 - Compact Map
11:21 - Flat Map
Go to squarespace.com/seanallen to save 10% off your first purchase of a website or domain using code SEANALLEN.
Explaining Filter, Map and Reduce in Swift is a very common iOS Dev interview question. In this tutorial I'll walk you through how Filter, Map and Reduce work and how to chain them together for more complex examples. I also show you how compact map and flat map work.
This tutorial was created using Xcode 14 and iOS 16.
iOS Developer Interview Questions Playlist:
youtube.com/playlist?list=PL8seg1JPkqgF5wazzCKSq3EEfqt3t8mvA
My iOS Dev Courses:
seanallen.teachable.com/?video=-mx_Kf3qKJY
My Closures Video:
youtu.be/ND44vQ5iJyc
Twitter:
Sean Allen - twitter.com/seanallen_dev
Hired.com:
hired.com/x/1n01g
Book and learning recommendations that help out the channel if you decide to purchase (Affiliate Links):
Paul Hudson's Hacking With Swift:
gumroad.com/a/762098803
Donny Wals - Combine:
gumroad.com/a/909014131
Mark Moeyken’s SwiftUI Books:
bigmountainstudio.com/swiftui-views-book/fzc51
Objc.io Books (Thinking in SwiftUI & Advanced Swift):
gumroad.com/a/656585843
#swift #softwaredeveloper #iosdeveloper
Timestamps:
0:00 - Filter, Map, Reduce
0:45 - Filter
3:02 - Map
4:35 - Reduce (simple)
6:05 - Reduce (on property)
7:17 - Chaining
10:18 - Compact Map
11:21 - Flat Map
