ReadDir and DirEntry

Explore how to use os.ReadDir() and os.DirEntry in Go to efficiently read directories and retrieve file information. This lesson covers replacing deprecated ioutil package functions with modern alternatives that improve performance and simplify code. You will understand how to recursively calculate directory sizes and prepare for advanced directory tree walking with fs.WalkDir().

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This lesson discusses os.ReadDir() and os.DirEntry. However, it begins by discussing the deprecation of the io/ioutil package—the functionality of the io/ioutil package has been transferred to other packages. So, we have the following:

os.ReadDir(), which is a new function, returns []DirEntry. This means that it can’t directly replace ioutil.ReadDir(), which returns []FileInfo. Although neither os.ReadDir() nor os.DirEntry offer any new functionality, they make things faster and simpler, which is important.
The os.ReadFile() function directly replaces ioutil.ReadFile(). ...

1.Course Introduction

2.Introduction to Go

3. Basic Go Data Types

4.Composite Data Types

5.Reflection and Interfaces

6.Go Packages and Functions

7.Telling a UNIX System What to Do

8.Go Concurrency

9.Building Web Services

10.Working with TCP/IP and WebSocket

11.Working with REST APIs

12.Code Testing and Profiling

13.Working with gRPC

14.Go Generics

15.Conclusion

16.Appendix A—Go Garbage Collector

ReadDir and DirEntry