Type-safe Functional Formatting in Swift

Representing data as text is a fundamental requirement of our everyday lives as engineers. Let's explore the various ways strings are typically formatted in Swift and Cocoa, where they fall short, and what we can do to build a more modular, compile-time-confident way of formatting our data.

Transcript

2. !
3. @STEPHENCELIS
5. TYPE-SAFE FUNCTIONAL FORMATTING IN SWIFT
6. STRINGS
7. printf
8. printf NSLog("Hello, %@!", "world") NSString(format: "Hello, %@!", "world")
9. %d %D %u %x %X %o %O %f %e %E %g %G %c %C %s %S %p %a %A %F
10. %0.2f
11. %ld %lx %lu
12. %@
13. HELLO, (NULL)!
14. HELLO, <USER: 0X7FB50DD1A130>!
15. printf NSLog NSString(format:) NS_FORMAT_FUNCTION
16. ! NS_FORMAT_FUNCTION
17. ! NS_FORMAT_FUNCTION
18. \(interpolation)
19. HELLO, OPTIONAL("WORLD")!
20. formatString
21. "YYYY-MM-DD" "yyyy-mm-dd"
22. "YYYY-MM-DD" "2016-12-365" "yyyy-mm-dd" "2015-23-31"
23. STRINGLY-TYPED
24. ! !
26. https://github.com/chrisdone/formatting
27. https://github.com/stephencelis/Formatting
28. THANKS!
29. !❓