JS: Execute function given name and args - in an isolate scope

exec_fun_w_args_isolated.js

var execIsolated = (function () {
  
  var exec = function () {
    arguments[0](arguments[1]);
  };

  return function (funcname, args) {
  
    args = args || [];
  
    // Determine "this" object for calling the function by name
    var funcThis = 'this';
    var funcParts = func.match(/('[^'\\]*(?:\\.[^'\\]*)*')|("[^"\\]*(?:\\.[^"\\]*)*")|[[\].]|([^'"[\].]+)/g) || [];
    var i = Math.max(funcParts.lastIndexOf('.'), funcParts.lastIndexOf('['));
    if (i > 0) {
        funcThis = funcParts.slice(0, i).join('');
    }
    var f = new Function(func + '.apply(' + funcThis + ',arguments)');
    exec(f, args);
  };

})();