To test if an object is any of specified types or traits:

Use the [any->isAnyOf] method. The following example tests whether an array is any of type set or array, and if so then inserts a new value into the array. Finally the result is output.

Code

local( mylocal = array )

if( #mylocal->isanyof(::set,::array) ) => {
  #mylocal->insert('OK')
}

#mylocal

Result

array(OK)