How can expensive evaluation be avoided in Go when LOG_LEVEL=DEBUG?

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One way to avoid expensive evaluation in Go when LOG_LEVEL=DEBUG is to use conditional logging. This means that you only run expensive operations and log statements when the log level is set to DEBUG. Here's an example:

if log.IsDebug() {
    // expensive operation
    result := someExpensiveFunc()
    log.Debugf("Result of expensive operation: %v", result)
}

In this example, the log.IsDebug() function checks if the log level is set to DEBUG. If it is, then the expensive operation (calling someExpensiveFunc()) is performed and the result is logged using log.Debugf(). If the log level is not set to DEBUG, then the expensive operation is skipped and no log statement is generated.

By using conditional logging in this way, you can avoid performing expensive operations and generating unnecessary log statements when the log level is not set to DEBUG. This can help improve the performance of your Go application, especially in production environments where you want to minimize the impact of logging on overall system performance.