How Can I Pretty-Print Complex Data Structures in Go?

Printing Complex Data Structures in Go

Printing complex data structures in Go can be challenging, especially when you want a representation that's both human-readable and well-indented. Ruby's awesome_print library offers an elegant solution for this task, and Go developers may wonder if there's an equivalent.

json.MarshalIndent: A Native Solution

While there are several third-party libraries available for pretty printing, Go also provides a native solution using json.MarshalIndent. This function converts the Go data structure into a JSON representation and allows you to specify indentation.

x := map[string]interface{}{"a": 1, "b": 2}
b, err := json.MarshalIndent(x, "", "  ")
if err != nil {
    fmt.Println("error:", err)
}
fmt.Print(string(b))

This code will produce the following output:

{
    "a": 1,
    "b": 2
}

Third-Party Libraries: More Formatting Options

For advanced formatting needs, you can explore third-party libraries like:

• PrettyHour: For formatting durations
• tablewriter: For printing tabular data
• beego: For complex structs with inline slice processing

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