Hello
A short hello to start the journal.
Read moreHello, I'm
Kaken He
A programmer who wanders between code and chronicles — East Asian culture, medieval Europe, and the art of building things.
Currently — Coding / Reading / Exploring
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Hello
A short hello to start the journal.
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About Swift
Swift is a fantastic way to write software for phones, tablets, desktops, servers, or anything else that runs code. It’s a safe and fast programming language that combines the best in modern language thinking with wisdom from a diverse open source community.
ViewVersion Compatibility
This book describes Swift 6.2.3, the default version of Swift that’s included in Xcode 26.2. You can use the Swift 6.2.3 compiler to build code that’s written in Swift 6.2.3, Swift 5, Swift 4.2, or Swift 4.
ViewA Swift Tour
Tradition suggests that the first program in a new language should print the words “Hello, world!” on the screen. In Swift, this can be done in a single line:
ViewThe Basics
Swift provides many fundamental data types, including Int for integers, Double for floating-point values, Bool for Boolean values, and String for text. Swift also provides powerful versions of the three primary collection types, Array, Set, and Dictionary, as described in Collection Types.
ViewBasic Operators
An operator is a special symbol or phrase that you use to check, change, or combine values. For example, the addition operator (+) adds two numbers, as in let i = 1 + 2, and the logical AND operator (&&) combines two Boolean values, as in if enteredDoorCode && passedRetinaScan.
ViewStrings and Characters
A string is a series of characters, such as "hello, world" or "albatross". Swift strings are represented by the String type. The contents of a String can be accessed in various ways, including as a collection of Character values.
ViewPhilosophy
What I Believe
- Code is craft, history is perspective.
- Build with patience, learn with wonder.
- The past illuminates the present.
- Every line of code tells a story.