Understanding D3-style JavaScript
D3 is designed and built using functional style JavaScript, which might come as a bit unfamiliar or even alien to someone who is more comfortable with the procedural or object-oriented JavaScript styles. This recipe is designed to cover some of the most fundamental concepts in functional JavaScript required to make sense of D3, and furthermore enable you to write your visualization code in the D3 style.
Getting ready
Open your local copy of the following file in your web browser: https://github.com/NickQiZhu/d3-cookbook-v2/blob/master/src/chapter1/functional-js.html .
How to do it...
Let's dig a little deeper into the good part of JavaScript, the more functional side. Take a look at the following code snippet:
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