Ian Johnson is the author of Tributary - an open source live-coding environment designed for prototyping data visualizations with D3. He also co-organizes the SF Bay Area d3 Meetup and makes educational D3 videos.
Data Visualization with D3
Now that we have a reusable table chart, the next task is to recreate the scatter plot. Ian copies in his code from Tributary, replaces the bars with circles and makes the code reusable.