Exploring Selection in D3

Notes :

1. select function lets you create d3 selections using a selector string where you can select elements that are already on the page.

2. selectAll :

• svg.selectAll('circle')
• It makes a d3 selection that contains all circles that exist within that svg.

1. In this example we see that d3.join has done the 'enter' ,'update' and 'exit' function internal work for us.