Javascript add extra argument

Question

Lets take a look at this code:

var mainFunction = function() {
  altFunction.apply(null, arguments);
}

The arguments that are passed to \"mainF

Answer 1

The arguments object isn't an array; it's like an array, but it's different. You can turn it into an array however:

var mainArguments = [].slice.call(arguments, 0);

Then you can push another value onto the end:

mainArguments.push("whatever");