Is there a universal way to draw user's content on web map in 3.x

[YukiHuang]

I am currently working with a web app, which could allow the users to log in with their ArcGIS Online Accounts and draw their contents on the map. The confusing part of this process is that it is really hard to determine which Function should I use to draw the layer. I come up with a matrix about the most used layers, and which function that needed to be used based on item's metadata. This might be incomplete:

type	displayName	ArcGIS Function	URL(ID) to Use
Web Map	Web Map	Map	itemid
KML	KML	KMLLayer	itemDataUrl
Feature Service	Feature layer	FeatureLayer	url
Feature Collection	Feature layer	FeatureLayer	itemDataUrl
Image Service	Imagery Layer	ArcGISImageServiceLayer	url
Vector Tile Service	Tile Layer	VectorTileLayer	url
Map Service	Tile Layer	ArcGISTiledMapServiceLayer	url
Map Service	Map Image Layer	ArcGISDynamicMapServiceLayer	url

Any suggestions for the best practice for this problem?

Thanks

[ThomasSolow · Accepted solution]

There's a Layer.fromPortalItem function in 4.XX but not in 3.XX as far as I know.  You may just have to call a different function based on the item type for each item in my contents.

[YukiHuang]

Yep, 4.x beat 3.x in this aspect. I am just so confused about the either "displayName" or "type" of a item cannot determine the resource "Real" type individually.