I think the author meant "just" as in: it is only another name. In Haskell, you can make an infix operator out of a function by putting it between backticks. Th

I think the author meant "just" as in: it is only another name. In Haskell, you can make an infix operator out of a function by putting it between backticks. Thus, `fmap` and <$> are synonyms. For example: (subtract 3) <$> [1,2,3,4] -- =[-2,-1,0,1] (subtract 3) `fmap` [1,2,3,4] -- =[-2,-1,0,1]