How can I use the fmt package for custom formatting in Go?

How can I use the fmt package for custom formatting in Go?

You can use the fmt package in Go to format strings, numbers, and other data types. For custom formatting, you can use verbs like %s for strings, %d for integers, and %f for floating-point numbers. You can also specify width and precision.

Can you give me an example of custom formatting?

Sure! Here's an example: fmt.Printf("%6s: %0.2f\n", "Price", 12.34567) will output ' Price: 12.35', aligning the text and rounding the number.

What if I want to format a struct?

You can implement the Stringer interface by defining a String() method for your struct. This method should return a formatted string representation of the struct.

Is there a way to format JSON using the fmt package?

While the fmt package is great for basic formatting, for JSON, it's better to use the encoding/json package, which provides functions like json.Marshal for proper JSON formatting.