ES6 vs ES5

.js

const f = ({ foo = "foo", bar = "bar" } = {}, ...args) => ({
  foo,
  [`${ bar }1`]: args,
})

// vs

var f = function(options) {
  var args = [].slice.call(arguments, 1)
  options = options !== undefined ? options : {}
  var foo = options.foo !== undefined ? options.foo : "foo"
  var bar = options.bar !== undefined ? options.bar : "bar"
  var result = {
    foo: foo,
  }
  result[bar + "1"] = args
  return result
}