D3 Notes.md

• D3 loves lists! When you do a .data(blah).enter(), blah needs to be list. You spent quite a bit of time wondering why things didn't work because your blahs were maps/objects.
  • Speaking of lists, use D3's array functions
• This is the margin convention. Follow it. Saves a ton of headaches.
• This is a great resource for scaling functions.
• "Save" the element you're adding to add to it later.
• Be minful of SO answers; stuff that's OK with v3 might not be for v4.

const background = svg.add.....
background.add(object1)
background.add(object2)
background.add(object3)