jxa-ex1.js

var _ = {
  map: function(arr, fn)  {
    var r = [];
    for (var i = 0, len = arr.length; i < len; i++) {
      r.push(fn(arr[i]));
    }
    return r;
  },
  filter: function(arr, fn) {
    var r = [];
    for (var i = 0, len = arr.length; i < len; i++) {
      if (fn(arr[i])) {
        r.push(arr[i]);
      }
    }
    return r;
  }
};

//---

function dumpProcessName(processes) {
  return _.map(processes, function(proc) {
    return proc.name();
  });
}

function dumpProcessInfo(processes) {
  return _.map(processes, function(proc) {
    var info = {};
    ["name", "shortName", "visible", "backgroundOnly"].forEach(function(prop) {
      info[prop] = proc[prop]();
    });
    return info;
  });
}

//---

var app = Application.currentApplication();
app.includeStandardAdditions = true;

var se = Application("System Events");

var visibleProcs = _.filter(se.processes, function(proc) {
  return proc.visible();
});

dumpProcessName(visibleProcs);