The big one for me is D3.js. I understand the core mechanic, and there are good resources out there from folks like Ben Clinkenbeard and Shirley Wu, but there are so many little moving parts you need to get to work quickly with that library. If it was the only thing I needed to learn I would be much further along, but hats off to people who have deeply mastered it; I think it's the most challenging JavaScript library/framework I've come across by a country mile.
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The big one for me is D3.js. I understand the core mechanic, and there are good resources out there from folks like Ben Clinkenbeard and Shirley Wu, but there are so many little moving parts you need to get to work quickly with that library. If it was the only thing I needed to learn I would be much further along, but hats off to people who have deeply mastered it; I think it's the most challenging JavaScript library/framework I've come across by a country mile.