Notes from the May-2018 Dev User Group

Composite APIs

This is a new feature from Salesforce, and it saves a significant number of API calls into Salesforce
You can have up to 25 REST API statements in one block of JSON.
NOTE: The API code can not have any conditional statements in it - it’s just one block with all of the records you want to query / create or update structured as a block of JSON then sent over to Salesforce.
So for example for multiple Order Line Items, you will loop through the list of Line Items in your code, and produce the JSON that has the 2 (+) Invoice Line Item POST statements
If any one of the items fails the whole lot will fail if allOrNone is set

Was Lightning Connect, then Salesforce Connect, now Connect - Data.
Plug and Play
Uses OData 2 or 4 with new specific Azure and SAP connectors in Summer18
Show data in Salesforce
Very expensive licencing costs
Now able to do triggers https://releasenotes.docs.salesforce.com/en-us/summer18/release-notes/rn_forcecom_external_data_triggers.htm and send custom headers.
Still no formulas

Build your own Salesforce Connect
https://www.youtube.com/watch?v=kEpY-AIX0SU&index=104&list=PLgIMQe2PKPSKN08-rnP2jnP5RDlzgMjQR
You build everything from scratch including the Auth. Provider.

Been around for a while, GA In Summer 18, but not ready for prime time, IMHO.
It's like SOAPiness for REST
Replacement for SOAP based Outbound Messaging
Uses Swagger or Interagent
Examples are a bit useless - no authentication https://andyinthecloud.com/2017/09/30/swagger-open-api-salesforce-like/ and https://www.youtube.com/watch?v=vdp8_TErWnk&feature=youtu.be
Setup is only in Lightning - External Services menu item in Summer 18
Does not do a LOT right now.

Simple data sources only - eg the API MUST return text values only
No JSON
No Number IDs (KI). https://success.salesforce.com/issues_view?id=a1p3A000000ne3EQAQ

Apparently will be able to be visible in and used directly in Apex soon - no known timeline though https://www.youtube.com/watch?v=EAYKkvsbjxQ&index=106&list=PLgIMQe2PKPSKN08-rnP2jnP5RDlzgMjQR

As a dev you need to know about Flows now
Lightning Flows - add Lightning components to Flows https://www.youtube.com/watch?v=W8BJ4yRBga0&index=56&list=PLgIMQe2PKPSKN08-rnP2jnP5RDlzgMjQR
Flow Actions Lists https://youtu.be/ZP5q1EjCEC4?t=897https://releasenotes.docs.salesforce.com/en-us/summer18/release-notes/rn_salesforce_console_for_service_flows.htm
Direct Data Queries - eg call an AWS Lambda function direct from the Flow

See http://lightningflow.net for all the new things, but remember most of these components are “community built” and are NOT supported by Salesforce (yet).