Standard conventions for indicating a function argument is unused in JavaScript

Question

Are there any standard ways of marking a function argument as unused in JavaScript, analogous to starting a method argument with an underscore in Ruby?

Answer 1

With browsers supporting destructuring one can do:

function ({}, {}, value) {
  // console.log(value)
}

Which is kind of neat in that it avoids the problem of multiple arguments having the same name and also won't create problems with libraries that assign methods to _ (lodash, underscore, etc.).

One problem with this approach is that unused arguments of type undefined or null will throw.

For undefined one solution is to use default parameters:

function ({}={}, {}={}, value) {
  // console.log(value)
}

Sadly no such easily applied solution for null.