Why Should I Avoid Using %v for Printing Integers and Strings?

The Consequences of Using %v for Printing Integers and Strings

While it is possible to use %v to print both integers and strings, it is not the recommended approach. Using %v for integers can lead to inconsistent formatting as the default format may change depending on the value of the integer. For example, large integers may be formatted with commas as separators, while small integers may be printed without separators.

Using %v for strings can also result in unexpected behavior. By default, %v will print the string representation of the object. However, if the object implements the fmt.Stringer interface, %v will invoke the String() method, which can return a different representation of the object. This can lead to confusion and inconsistent output.

To ensure consistent formatting and predictable behavior, it is best to use the appropriate format specifier for each data type: %d for integers and %s for strings.

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