Thanks for pointing this out, it’s a good point. My wording was a bit sloppy here, what I was trying to convey was that List / Array are probably the most likely things that people will have already mapped over, even if they didn’t realise they were functors. I’ll improve the sentence to convey this better.
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I disagree. I think the most common (mappable) container (in F#) is a record. See the monomorphic functors article by Mark Seemann.
Thanks for pointing this out, it’s a good point. My wording was a bit sloppy here, what I was trying to convey was that List / Array are probably the most likely things that people will have already mapped over, even if they didn’t realise they were functors. I’ll improve the sentence to convey this better.