Today I learned modern javascript. I had wanted to learn that since programming in old-style javascript is much painful for me. I read the page "getting started" in the official web site. In the page, I learned "webpack" which is a bundle tool to combine multiple scripts and to create one all in one script. It seemed a development framework since the official document instructed directory layout of the project. Successfully, I could build example project specified in the official page. Next, I tried to migrate my old-style project to a new modern style using webpack. It also succeeded.
