Chris Granger - Light Table - a new IDE concept: "Docs everywhere
When you're looking at new code it's extremely valuable to be able to quickly see documentation left behind by the author. Normally to do so you'd have to navigate to the definition of the function, but lightable ghosts this information in to the side. Want to know what partial does? Just put your cursor on top of it. This makes sure you never have to worry about forgetting things like argument order ever again.
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