淺談 Golang v1.21 new function min max clear

Transcript

1. 淺談 Golang v1.21 new function min max clear 2023.12.16
2. Fionn Kuo • Fionn88@Github.com • Fionn Kuo@LinkedIn.com Contact： • Previously worked as a Site Reliability Engineer at CMoney. • Gopher • Passionate about So ware engineering, DevOps, and SRE culture
3. Max Min Function Prior to the built-in min and max functions Why is it designed this way Clear Function Prior to the built-in clear functions Summary Agenda
4. Max Min Function Example
5. Max Min Function Limited
6. Source Code Max Min Function
7. cmp • Provides types and functions related to comparing ordered values. Source Code Max Min Function
8. Example Prior to the built-in min and max functions
9. Special Cases： 1. If either x or y is Positive Infinity, the function returns Infinity. 2. If either x or y is NaN, the function returns NaN. 3. If both x and y are 0, and the sign bit of x is Negative, meaning Signbit(x) is true, then it returns y. This scenario addresses the comparison between -0.0 and 0.0. Source Code Prior to the built-in min and max functions
10. Prior to the built-in min and max functions Source Code
11. Why is it designed this way
12. Clear Function Example
13. func clear func clear[T ~[]Type | ~map[Type]Type1](t T) If the argument type is a type parameter, the type parameter's type set must contain only map or slice types, and clear performs the operation implied by the type argument. For maps, clear deletes all entries, resulting in an empty map. For slices, clear sets all elements up to the length of the slice to the zero value of the respective element type. — The clear built-in function clears maps and slices. Clear Function 代表任何 Go 的類型
14. type Type type Type int type Type1 type Type1 int Type is here for the purposes of documentation only. It is a stand-in for any Go type, but represents the same type for any given function invocation. Type1 is here for the purposes of documentation only. It is a stand-in for any Go type, but represents the same type for any given function invocation. Clear Function
15. Prior to the built-in clear functions Example
16. Prior to the built-in clear functions Example
17. Prior to the built-in clear functions Example
18. Reference • min/max being builtins vs being in package cmp • Unique Capability of the clear Function: Removing Irreflexive Keys with NaN Values from Maps
19. Summary • Makes it easier for beginners to understand. • Reduces the development workload for Gophers.
20. The End