Add records with optics example #34
Merged
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For #9
Shows how to use
set,over, andviewand also has a little example for how to compose simple lenses. I think adding the%example makes sense since nested record updates aren't so rare and I think this hints at the many possibilities that lens composition offers without introducing anything too complex.The
TemplateHaskellpart could be replaced by manually writing some lenses but considering how common it is to use TH here I'd keep TH.