erius/shad-go
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[lectures/09-io] Update ioutil slides.

Browse source
This commit is contained in:
Arseny Balobanov 2021-04-15 19:02:43 +03:00
parent db4d258911
commit 8ebf63b84a
1 changed files with 16 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
lectures/09-io/lecture.slide
View file

@ -136,6 +136,20 @@ Package *io/ioutil* implements some I/O utility functions.
func TempFile(dir, pattern string) (f *os.File, err error) func TempFile(dir, pattern string) (f *os.File, err error)
func WriteFile(filename string, data []byte, perm os.FileMode) error func WriteFile(filename string, data []byte, perm os.FileMode) error
* ioutil as of Go 1.16
The same functionality is now provided by package *io* or package *os*, and those implementations should be preferred in new code.
ioutil.Discard -> io.Discard
ioutil.NopCloser -> io.NopCloser
ioutil.ReadAll -> io.ReadAll
ioutil.ReadDir -> os.ReadDir
ioutil.ReadFile -> os.ReadFile
ioutil.TempDir -> os.TempDir
ioutil.TempFile -> os.TempFile
ioutil.WriteFile -> os.WriteFile
* ReadAll * ReadAll
Convenience method for Reader → []byte conversion. Convenience method for Reader → []byte conversion.
@ -418,7 +432,7 @@ Useful when you want to use code that takes an io.Writer, and store the results
- useful if you don't want to read the whole file into memory - useful if you don't want to read the whole file into memory
- has no internal buffers - has no internal buffers
*ioutil.ReadFile* reads an entire file into memory (as a []byte) in a single call *os.ReadFile* (ioutil.ReadFile) reads an entire file into memory (as a []byte) in a single call
- allocates a byte slice of the correct size (no need to Read + append in a loop) - allocates a byte slice of the correct size (no need to Read + append in a loop)
- closes the file - closes the file
@ -432,7 +446,7 @@ There are also
* Summary * Summary
- *io* defines interfaces that handle streams of bytes (Reader, Writer, etc...) as well as functions that work generically with types implement these interfaces (e.g. io.Copy) - *io* defines interfaces that handle streams of bytes (Reader, Writer, etc...) as well as functions that work generically with types implement these interfaces (e.g. io.Copy)
- *io/ioutil* provides helper functions for some non-trivial file and io tasks - *io/ioutil* (deprecated) provides helper functions for some non-trivial file and io tasks
- *testing/iotest* implements Readers and Writers useful mainly for testing - *testing/iotest* implements Readers and Writers useful mainly for testing
- *bufio* provides buffering wrapper for io.Reader and io.Writer that can improve efficiency - *bufio* provides buffering wrapper for io.Reader and io.Writer that can improve efficiency
- *bytes* provides helper functions and types for interacting with byte slices - *bytes* provides helper functions and types for interacting with byte slices