Go Package io: Difference between revisions
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Files opened with <code>[[Go_Package_os#os.Create.28.29|os.Create()]]</code> implement <code>io.Reader</code>. | Files opened with <code>[[Go_Package_os#os.Create.28.29|os.Create()]]</code> implement <code>io.Reader</code>. | ||
==Wrapping a <tt>[]byte</tt> into a < | ==Wrapping a <tt>[]byte</tt> into a <tt>Reader</tt>== | ||
A <code>[]byte</code> can be wrapped into a <code>Reader</code> with: | A <code>[]byte</code> can be wrapped into a <code>Reader</code> with: | ||
<syntaxhighlight lang='go'> | <syntaxhighlight lang='go'> | ||
Revision as of 18:14, 5 January 2024
External
Internal
Overview
The io package consists of a few functions, but mostly interfaces used by other packages.
Reader
An interface that exposes Read().
Readers can be used to unmarshall JSON into structs as shown here:
Files opened with os.Create() implement io.Reader.
Wrapping a []byte into a Reader
A []byte can be wrapped into a Reader with:
bs := []byte("something")
r := bytes.NewReader(bs)
Writer
Files opened with os.Create() implement io.Writer.
Closer
Files opened with os.Create() implement io.Closer.
ReadCloser
An interface that exposes basic Read() and Close() methods. The http.Request body is a ReadCloser. See Reader.