#sdev

Camiseta feita para Escola da Vida. 

Don’t put refactoring stories on the backlog. Instead, invest in learning what habitable code looks like, how to write habitable code, and how to improve the habitability of existing code. That’s what will make you go fast; that’s what will get you out of the thickets.

The density of problems is very visible to us now, and we see that we can’t just take a quick wipe at the field and do ourselves any good. We have a lot of refactoring to do to get back to a clean field. We are tempted to ask for time from our product owner to refactor. Often, that time is not granted: we’re asking for time to fix what we screwed up in the past. Not likely anyone is going to cut us any slack on that. If we do get the time, we won’t get a very good result. We’ll clean up what we see, as well as we can in the time available, which will never be enough. We took many weeks to get the code this bad, and we’ll surely not get that many weeks to fix it.

Floating-point arithmetic is considered an esoteric subject by many people. This is rather surprising because floating-point is ubiquitous in computer systems. Almost every language has a floating-point datatype; computers from PCs to supercomputers have floating-point accelerators; most compilers will be called upon to compile floating-point algorithms from time to time; and virtually every operating system must respond to floating-point exceptions such as overflow. This paper presents a tutorial on those aspects of floating-point that have a direct impact on designers of computer systems. It begins with background on floating-point representation and rounding error, continues with a discussion of the IEEE floating-point standard, and concludes with numerous examples of how computer builders can better support floating-point.

Low-cost, three-dimensional (3D) desktop printing, although still in its infancy, is rapidly maturing, with seemingly unlimited potential. The hope is that this cutting-edge 3D technology will open new dimensions to science and education, and will make a marked impact in developing countries. This book gives a reasonable, first overview of current research on 3D printing. It aims to inspire curiosity and understanding in young scholars and new generations of scientists to motivate them to start building up their own 3D printing experiences and to explore the huge potential this technology provides –with the final goal of putting learning literally in their hands.

Ray Anderson: The business logic of sustainability

Example illustrating a Java main() method that delegates immediately to dependency injection via Guice.