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1What Swift is
2A brief history: from Objective-C to Swift
3Installing Xcode
4Playgrounds: experimenting with code
5Your first Swift program
6Swift outside Apple: server and Linux
7Variables with var and let
8Type inference and type annotations
9Strings and interpolation
10Numbers: Int, Double, Float
11Booleans and tuples
12Optionals: the heart of Swift
13Unwrapping: if let and guard let
14Nil-coalescing and optional chaining
15Force unwrapping: why to avoid it
16if, else, and switch
17Switch with pattern matching
18for-in loops and ranges
19while and repeat-while
20guard for early exits

1What Swift is
2A brief history: from Objective-C to Swift
3Installing Xcode
4Playgrounds: experimenting with code
5Your first Swift program
6Swift outside Apple: server and Linux
7Variables with var and let
8Type inference and type annotations
9Strings and interpolation
10Numbers: Int, Double, Float
11Booleans and tuples
12Optionals: the heart of Swift
13Unwrapping: if let and guard let
14Nil-coalescing and optional chaining
15Force unwrapping: why to avoid it
16if, else, and switch
17Switch with pattern matching
18for-in loops and ranges
19while and repeat-while
20guard for early exits

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Lesson 13 of 2,511·1. Getting StartedFree lesson

Unwrapping: if let and guard let

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