refactor: change variable to let & const, add destructuring parameter

[jdnielss]

Hi,

your repository is good for me, to learn many Framework like Angular, React and Vue.

but I wanted to share an example of using Destructuring to extract props, it's very useful if you only want to use a few props, and it's great for beginners for me and others. but I wanted to share an example of using Destructuring to extract props, it's very useful if you only want to use a few props, and it's great for beginners for me and others. and change the use of var to let and const, to avoid re-assign variables because the nature of var is global.

here is a list of change i made :

• Change Variable Var to Let and Const
• Using Destructuring to extract props