# Convert Number to Word

I introduce the way to convert number to word

# (日本語) JSON をパースする方法

Sorry, this entry is only available in Japanese.

# Rails: Different Code according to the Environment

The code executes different method according to the environment, in Rails. In this way, you can show message only in development environment.

# Ruby: Difference among and, &&, & , or, ||, |

In Ruby, we can use and, &, &&. And also or, |, || we can use. I researched about their difference.