Notes about HackerRank. What is HackerRank? HackerRank is a learning site where you can learn programming by solving problems. While most of these sites specialize in either web development or competitive programming, HackerRank covers bot…

Comparison of process interruption tool What is binding.pry? While debugging, the engineers sometimes want to see the variable values at that point. If your language is static and you use IDE, you can set break point by GUI tools. However,…

Lie-down Programming Preface I think resting your body is important for being in good shape until the end of retirement. Even if you are smart, sometimes you have to quit jobs due to the pain of the back. Lying down and resting is importan…