I received an error when testing a lightning web component. 

Invalid key value "[object Object]" in [Object: vm undefined (93)]. Key must be a string or number.

I am not sure what this error means or what it is referrencing. Does anyone know what this means?

What is the difference between using a system.runas() method with a user without inserting the user or with inserting user. E.g:

User u = new User(...);
system.runAs(u){}

Vs

User u = new User(...);
insert u;
system.runAs(u){}

And which one is preferred as best practice?

TIA

Hi,
  Is there any way to group apex classes like packages or namespaces.

Thanks.

Hello,

I am looking for a Solution  to convert one currency to another bewteen two records from two different Custom Objects. I am not using DatedExchange rates here. I want to access the Salesforce Standard Conversion rate Table where we will be updating the Currencies and their conversion rates manually.  Is there an API name to get the std Conversion Rate Table like "DatedConversionRate" for Dated Exchange Rates? 
I need to refer that and include the logic to convert one currency value to another.

Any suugestions to this would be great.  Thanks in Advance!!! 

-Sara

why is list ordered and map/set are unordered??
can someone explain in detail.i know that list is ordered and set is unordered