console.clear();

​

function doStuff(one, two, options) {

  options = options || {};

  let a = options.a,

      b = options.b,

      c = options.c,

      d = options.d;

  // more code here...

  console.log(options.a, options.b, c, d);

​

}

​

doStuff('example1', 'example2', {

  a: 'opt1',

  b: 'opt2',

  c: 'opt3',

  d: 'opt4'

});