javascript - js Who can explain this function?

Question

function uncurryThis(){
  return function(){
    return Function.call.apply(fn,arguments)
  }
}

call and apply are used together. . . don't know

Answer 1

That’s apply function "call"

Answer 2

If you understand what currying means, this function will be easy to understand.

The function of this function is decurrying.

In fact, it is similar to the fn()() call.