notes.txt

#### JS EVENTS

You're probably only interested in a few mouse events, but: https://developer.mozilla.org/en-US/docs/Web/Events


#### WHEN FAT ARROWS FAIL US


This ES4 function:

    function (d) {
      d3.select(this).attr('fill', 'red')
    }

Becomes this ES6 function:

    (d) => (d, i, nodes) {
      d3.select(nodes[i]).attr('fill', 'red')
    }

We can't use 'this' with fat arrows




#### YOUR .gitignore FILE CONTENTS

You can start from gitignore.io

    # Custom files
    .DS_Store
    dist

    # Optional npm cache directory
    .npm

    # Optional eslint cache
    .eslintcache

    # parcel-bundler cache
    .cache

    # Logs
    logs
    *.log
    npm-debug.log*
    yarn-debug.log*
    yarn-error.log*

    # Optional npm cache directory
    .npm

    # dotenv environment variables file
    .env

    # Optional eslint cache
    .eslintcache

    # Dependency directories
    node_modules/