How Can I Find Functions Returning Specific Types in Go?

Locating Functions and Types Based on Return Value

In Go, finding all functions that return a specific type can be challenging. Yet, there are several methods to approach this task.

Using the Official Go Website

The search field at the top of Go's official website (golang.org) allows for searching by type. For instance, searching for "Writer" yields results grouped into categories such as types, package-level declarations, and local declarations.

Considering Interface Implementation

When dealing with interfaces like io.Writer, keep in mind that types implicitly implement interfaces by defining the interface's methods. This means finding explicit type creations and returns can be difficult.

Searching Non-Interface Types

Searching for non-interface types, like bytes.Buffer, is more straightforward. In the documentation, the Index section groups package functions and methods by type, providing a convenient way to locate those returning the desired type.

Checking Package Dependencies

Godoc.org offers the ability to check package dependencies. For example, examining the packages that import the io package can be a good starting point for finding functions that return io.Writer, although this method can be exhaustive due to io's widespread use.

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