Tinkerer, crossfiter and a music junky... Maker of: http://musicmeal.io / https://twitter.com/AudioPlayer3 & https://twitter.com/BirdOfKnowledge & https://twitter.com/JanusWorkspace
IMO they just wanted to see if anyone knows what currying is. This being said there are two things
I haven't seen anyone use currying in my past 6 years as a developer, neither at work or at code examples of finished products. I have recently seen it as part of articles, to which there are links in my article.
If they are actually using it - WHY? being able to support handling arguments that way is weird and is a step away from also handling sum([5,3]), or sum ([5,[[3]]]) or something weirder, that I can't think of right now.
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IMO they just wanted to see if anyone knows what currying is. This being said there are two things