How to get the data of a node in d3

In my previous article on enter, update and exit selections, I discussed how d3 binds data to nodes using the data() function. How about the inverse case where you have a reference to a node to which data is supposedly bound and you want to get the value of that data. Take another case - when you have a reference to a node, but you want to access the data that is bound to a parent node. Turns out, you can easily get the data bound to a node as follows

d3.select(your_node).datum();

Also Read:

1. A visual explanation of the Enter, Update and Exit Selections in D3js
2. JavaScript Objects and Arrays Useful Methods
3. d3 Fundamentals : Understanding domain, range and scales in D3js
4. Render a d3 tree with a minimum distance between the tree nodes
5. Using d3js to draw a bar chart with an axis and some basic transitions