collections - How to make Groovy arrays comparable? -

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tried this: 

   arraylist.metaclass.compareto = {arg -> this?.size() <=> arg?.size() }      [1]<=>[2]

it doesn't work.

there still exception rises groovy.lang.groovyruntimeexception: cannot compare java.util.arraylist value '[1]' , java.util.arraylist value '[2]'

one approach implement comparator interface.

another use metaclass wanted, not able use <=> operator since list doesn't implement comparable.

list.metaclass.compareto = { collection other ->     delegate.size() <=> other?.size() }  def x = [1, 2, 3] def y = [4, 5]  println x.compareto(y)  // x <=> y won't work

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