Can fmt.Printf Reuse Arguments in the Format String?

Reusing Arguments in fmt.Printf

The fmt.Printf function allows for convenient string formatting with variable arguments. However, it may sometimes be desirable to reuse an argument multiple times within the format string.

Question:

Consider the following code:

fmt.Printf("%d %d", i, i)

Is there a way to reuse the argument i without specifying it twice?

Answer:

Yes, fmt.Printf supports using explicit argument indexes to reference arguments multiple times. The [n] notation can be used for this purpose, where n is the index of the argument to reuse.

Example:

To reuse the argument i in the example above:

fmt.Printf("%[1]d %[1]d\n", i)

Output:

1 1

Here, %[1] indicates that the argument at index 1 (which is i) should be reused. This allows for concise and efficient formatting without the need to repeat arguments.

Additional Information:

This feature is particularly useful when working with complex format strings or when dealing with large numbers of arguments. The [n] notation provides a powerful way to control the placement and reuse of arguments.

The above is the detailed content of Can fmt.Printf Reuse Arguments in the Format String?. For more information, please follow other related articles on the PHP Chinese website!