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Friday, July 13, 2012

Writing great software (or anything) means managing your energy.

I've learned one big thing over the past weeks of writing Objective-C (a.k.a iOS or iPhone) code for the first time.  When you feel like the thing you're staring at should work and you don't know why, STOP WORKING!

I have a theory behind this rule.  I borrowed it from Tony Schwartz. The theory is after about 90 minutes the average human starts to lose focus and higher-level cognitive functions drift.  Most artists, developers, writers - you cats - are above average, so maybe you get two hours at the outside.  So after about two hours the extra-ordinary human loses the ability to differentiate between minute details, which is what these silly, frustrating, "why-can't-I-figure-this-blasting-thing-out" problems are all about.

The solutions to silly software problems that make developers like me crazy end up being things like:

  • I included a source file instead of a header file.
  • The index was 0 instead of 1.
  • The name of a variable was misspelled - "tacoTrock" instead of "tacoTruck".  
  • I accidentally overloaded a method name as a variable.
These are all really simple, dumb things.  Good defensive programming can help you avoid them.  For example, using a great IDE (integrated development environment) that has autocomplete and text highlighting will help you avoid spelling errors.  Never using "set" to start a method name helps avoid overloading implicit setters/getters.  Using "isFoo" for boolean variables helps you avoid getting confused by true/false states and "didFoo" is a great naming convention for callbacks/delegates.  

But these practices are not enough; even if you write perfect code with perfect style, you're gonna hit a wall.

When you hit the wall, walk away.  Over the past month or so I've tried to step away for 10-20 minutes when I hit the wall.   When I return to work I've found the answer in less than 15 minutes.  Every. Single. Time.  And when I don't step away?  I waste upwards of an hour and don't get the answer.

Every. Single. Time.

Maybe I'm insane or just far below average, but I doubt it.  Rather, I think we all have to manage our energy very carefully.  Skeptical?  Just try it - run your own experiment.  

If you're a type-A overachiever you will probably feel bad about not working during those 10-20 minutes.  I know I still struggle with these feelings.  So try saying, 

"I am running an experiment.  Good science makes for good products, so practicing this good science for two weeks is a good idea.  At the end of two weeks I will evaluate my progress.  In the meantime, I can't argue with how nice it is to walk up to the coffee shop in the sun..."
If you wonder why I'm at Verite most days between 2:30 and 4:30 it's because A) the Red Sox don't start playing until 4:15PST most days and B) I generally need that walk-to-the-coffee-shop break 2 hours after lunch!

Want to know more about managing your energy?  I wrote about it in Shipping Greatness, and you can also read Tony Schwartz's book.

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