I didn't mean to include D3 I meant that after using D3 you will know things like what a Dendrogram is and how to use it to visualize a dataset. Knowing this (for example) might give you ideas of developing a similar visualization in CSS.
One thing we might agree on (or not) is hiring. I don't believe in technical tests, take-home projects or really any demonstration of mastery of any particular skill set. When I interview and hire I mainly look for two things:
Does the individual truly love the art and science of software development?
Are they a self-starter? ie. do they go out and learn new software development tools, techniques, ideas, etc. on their own without having to be told to do this?
To the extent that both of those are true, you're hired!
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