ES7 Proposal: The Pipeline Operator(github.com)

    function double(str) {
      return str+', '+str;
    }
    function ucase(str) {
      return str.slice(0,1).toUpperCase()+ str.slice(1);
    }
    function exclamation(str) {
      return str+"!";
    }
    
    var _="hello";
    _ = double(_);
    _ = ucase(_);
    // _ = foo(_);
    _ = exclamation(_);
    
    console.log(_); // Hello, hello!
    
    function pipe() {
      var functions=[];
      for(var i=0; i<arguments.length; i++) {
        functions[i]=arguments[i];
      }
      return function pipe_call(arg) {
        for(var i=0; i<functions.length; i++) {
          arg=functions[i](arg);
        }
        return arg;
      }
    }
    
    var _="hello";
    _ =pipe(
      double,
      ucase,
      // foo,
      exclamation
    )(_);
    console.log(_); // Hello, hello!

    _(array)
    .compact()
    .map(function(x) {
       return x * x;
    })
    .filter(function(x) {
        return x > 100;
    }).value()

    custom(filter(map(compact(array), function(x) {
         return x * x;
    }), function(x) {
         return x > 100;
    }));

    compact(arr)
    |> map(function(x) {
        return x * x;
    })
    |> filter(function(x) {
        return x > 100;
    })
    |> custom

    (defn do-stuff [params-map]
       (->
          (build-object params-map)
          (do-thing-with-object)
          (extract-thing)
          (format-thing)))

    attrs
        |> bounded('age', 1, 100)
        |> format('name', /^[a-z]$/i)
        |> Person.insertIntoDatabase

  let names = document.querySelectorAll('.entry')
                      .sortBy('title')
                      .filter(entry => entry.getAttribute('data-url') in whitelist)
                      .map(entry => entry.getAttribute('name');