Anything that substitutes ‘this’ but doesn’t want to put a function into that object.

  const {filter} = []
  class Foo {
    less() {
      return filter.call(this, sometest)
    }
  }

There is no way to closure it somehow without (temporarily) modifying an instance of Foo. (The next obvious question is “why” and the answer is “metaprogramming”.)