Trying to get a wedge into this stuff... So how do I get the value of a field ?

I wrote this RESTlet:

/**
*@NApiVersion 2.x
*@NScriptType Restlet
*/
define([ 'N/record' ], function(record) {
function getWorkOrder() {
var rec = record.load({
type : record.Type.WORK_ORDER,
id : 2154686,
isDynamic : false,
});

var assyField = rec.getField('assemblyitem');
var qtyField = rec.getField('quantity');

return {
id : 2154787,
assy : assyField,
qty : qtyField
};
}
return {
get : getWorkOrder
};
});


and the result is this:

{
  "id": 2154787,
  "assy": {
    "id": "assemblyitem",
    "label": "Item No",
    "type": "select"
  },
  "qty": {
    "id": "quantity",
    "label": "Quantity",
    "type": "posfloat"
  }
}

been staring at the docs - so far I'm baffled as to how to get the value - even of a scalar like quantity.