The Elixir |> (pipeline / nose) operator. Makes functional programming much cleaner without brackets or intermediate variables. I wish more programming language has this. JavaScript comes close with chained calls of map.
This is common in the functional paradigm, although syntax and semantics varies in sometimes important ways among languages.
There's a long-standing TC39 proposal to add it to JS. It's interesting to read it to see examples of the aforementioned differences.