How to find documentation for a specific Golang function?

How to find Golang function documentation: Use the godoc -src funcName command to generate HTML documentation. Search the function name at https://pkg.go.dev to view the online documentation. Find documentation directly in your code editor using built-in features like Quick Find Source in VSCode.

#How to find documentation for a specific Golang function?

Introduction

The Go language provides rich documentation for its vast standard library, with detailed descriptions of every function, type, and package. During development, finding documentation quickly and efficiently is critical to understanding how an API works and using it correctly.

Using the godoc tool

Go provides a built-in tool godoc for generating HTML documentation for the standard library. To find documentation for a specific function, use the following command:

godoc -src funcName

For example, to find documentation for the fmt.Println function, run:

godoc -src fmt.Println

This will browse Opens a page in the browser that contains a detailed description of the fmt.Println function, including its signature, parameters, return value, and usage examples.

Online documentation

The Go language official website also maintains a documentation library, which contains documentation for the standard library. You can find documentation for a specific function by visiting https://pkg.go.dev and entering the function name in the search bar.

Using the Go Editor

Some integrated development environments (IDEs) and code editors have built-in functionality that makes it easy to find function documentation. For example, in VSCode, you can place the cursor over a function name and press F1 (Command click on macOS) to invoke the Quick Find Source action.

Practical case

Suppose you are using the time.Since function in the time package. To quickly view its documentation without leaving the code editor, you can use the following steps:

1. Place the cursor over time.Since in VSCode.
2. Press F1 (or Command click ) to open the Quick Find Source window.
3. Select the time.Since function in time package.

This opens the documentation for the time.Since function, which contains details about its signature and a usage example showing how it works.

By using the above method, you can quickly and efficiently find documentation for specific functions in Golang, thereby improving your development efficiency and understanding the API of the standard library.

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