How can I use fmt.Sprintf-compatible syntax with errors.New?

Formatted Errors with fmt.Sprintf-Compatible Syntax

To provide a version of errors.New accepting fmt.Sprintf-like parameters, a custom function can be defined as follows:

<code class="go">func NewError(format string, a ...interface{}) error {
    return errors.New(fmt.Sprintf(format, a))
}</code>

However, this implementation encounters a problem where the variadic argument a is treated as a single array parameter, causing issues with formatting.

To resolve this, it is necessary to ensure that a is interpreted as a variable number of arguments. This can be achieved by utilizing the three-dots notation ..., ensuring that fmt.Sprintf is aware of the variadic nature of the a argument:

<code class="go">func NewError(format string, a ...interface{}) error {
    return errors.New(fmt.Sprintf(format, a...))
}</code>

By adding the three-dots to the a argument, the custom NewError function can now correctly format error messages using fmt.Sprintf-compatible syntax.

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