How do you keep debug code out of production?

Question

It happens to the best of us.

Particularly when dealing with languages without built in debugging capabilities such as breakpoints and watched variables, these bugs bite developers. Debugging code, alerts and Response.Writes, show up in production code.

How do you separate debugging concerns from functional code in javascript, php, or vbscript? How do you ensure those debugging changes never enter production environments?

Answer 1

The most simple method

define("DEBUG", true);   if (DEBUG) {     echo "Debug Method"; } 

For js its similar.

Answer 2

Human error is hard to prevent

https://meta.stackexchange.com/questions/71780/lol-debugging-are-we-so-homepage-alerts-false