Return the property corresponding to the fieldName, supposing we have a JsObject.
the name of the property to look up
the resulting JsValue wrapped in a JsLookup. If the current node is not a JsObject or doesn't have the property, a JsUndefined will be returned.
Look up fieldName in the current object and all descendants.
the list of matching nodes
Access a value of this array.
Access the head of this array.
Access the last element of this array.
Access the tail of this array.