Enter And Exit

• This may be the most confusing part since learning d3.js
• First, we should consider
• You can think
  enter()
  set a placeholder for each data element, and the method after it is iterating do something to each data element in your data set.
• If the number of data has changed which is very common, we can use
  exit()
  to specific the unbinding element, or using
  enter()
  and
  append()
  to visualize new data element.

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