class JMESPath::Nodes::AbsFunction

def call(args)
  if args.count == 1
    value = args.first
  else
    return maybe_raise Errors::InvalidArityError, 'function abs() expects one argument'
  end
  if Numeric === value
    value.abs
  else
    return maybe_raise Errors::InvalidTypeError, 'function abs() expects a number'
  end
end