| - in Haskell <> is binary operator of a Monoid - in Elixir <> is Binary concatenation operator. Concatenates two binaries. This seems like it might be kind of a joke, actually, purposefully confusing "binary operator" with "an operator that takes two binaries" for humorous effect? - in Gleam <> is string concatenation operator As far as I can see it, they are taking inspiration from Haskell, where <> denotes the monoid binary operation, one concrete example being in the monoid of Lists binary operator being list concatenation, of which String is one example. But really, <> for inequality is also kind of dumb and nonstandard idea (from mathematical notation perspective), originating from Algol. != which C popularized is more clear, and corresponds to the mathematical symbol, of course =/= would be even more close, but that is one more character. ML originally used <> for inequality, following the standard (in CS) of Algol, and it was Haskell which deviated from that tradition. So F# uses still Algol tradition, but Haskell uses /= and C and others use !=, for more mathematical and logical notation. |