This video walks through all the essential language features of Swift in just under one hour, and is aimed at two groups of people: folks who have completed up to day 14 of the 100 Days of SwiftUI and want to review what they've learned, and developers with extensive experience of other languages who want to transfer their knowledge to Swift quickly. This video is very fast! If you're struggling to understand concepts such as arrays, functions, closures, and similar, you should consider following the videos in my 100 Days of SwiftUI course at https://www.hackingwithswift.com/100/swiftui – they are much slower, providing much more explanation and example code along the way. 00:00 Introduction 01:21 Creating constants and variables, 01:59 Strings 03:38 Integers 04:38 Decimals 05:01 Booleans 05:23 Joining strings 05:59 Arrays 07:39 Dictionaries 08:16 Sets 09:10 Enums 09:40 Type annotations 11:50 Conditions 12:46 Switch statements 13:25 The ternary conditional operator 13:55 Loops 16:24 Functions 17:39 Returning multiple values from functions 18:45 Customizing parameter labels 19:52 Providing default values for parameters 20:38 Handling errors in functions 22:46 Closures 25:02 Trailing closures and shorthand syntax 26:22 Structs 27:43 Computed properties 28:37 Property observers 29:16 Custom initializers 30:10 Access control 31:56 Static properties and methods 32:42 Classes 39:49 Protocols 43:49 Extensions 46:00 Protocol extensions 49:31 Optionals 49:31 Unwrapping optionals with guard 51:34 Nil coalescing 53:06 Optional chaining 54:09 Optional try? 55:37 Wrap up 56:52 Dog reward