How Can I Efficiently Find Interface Implementations in the Go Standard Library?

Finding Implementations of an Interface in the Standard Library

Identifying types that conform to a particular interface in Go's standard library can be a valuable skill. However, it's not always intuitive. And relying solely on experience may not be the most efficient approach.

Identifying Interface Implementations

The standard library provides a variety of tools that can assist in this process. One option is to use the egrep command:

egrep -nr '^func (.*) ReadByte\(' *

This command searches the source code for all occurrences of a function that begins with "func" and includes the method name "ReadByte" in parentheses.

Example

Consider the ByteReader interface in the io package, which defines a method for reading a byte. Using the egrep command, we can list all types in the standard library that implement this interface:

lnml@fsc-r630:~/go/src/pkg$ egrep -nr '^func (.*) ReadByte\(' *
bufio/bufio.go:165:func (b *Reader) ReadByte() (c byte, err error) {
bytes/reader.go:59:func (r *Reader) ReadByte() (b byte, err error) {
bytes/buffer.go:289:func (b *Buffer) ReadByte() (c byte, err error) {
encoding/xml/xml_test.go:234:func (d *downCaser) ReadByte() (c byte, err error) {
strings/reader.go:58:func (r *Reader) ReadByte() (b byte, err error) {

As we can see, the Reader type in the bufio, bytes, encoding/xml, and strings packages all implement the ByteReader interface.

Additional Resources

In addition to egrep, the Go website (golang.org) offers a case-sensitive search feature that can help locate specific interface implementations. By combining these tools with knowledge of the standard library, developers can effectively identify types that satisfy a desired interface.

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