Salesforce create account Json

[SumathiSomala]

Hi ,
I am using below create account jSON to create account in Salesforce.
I need help to create logic for Alias attribute.

{
"Alias": "${user.firstname.toString().substring(0,1)}${user.lastname.toString().substring(0,4)}",
"Email":"${user?.getEmail()}",
"Username":"${user?.getEmail()}",
"CommunityNickname":"${user?.getFirstname()}${user?.getLastname()}",
"FirstName":"${user?.getFirstname()}",
"LastName":"${user?.getLastname()}",
"TimeZoneSidKey":"America/Los_Angeles",
"LocaleSidKey":"en_US",
"EmailEncodingKey":"ISO-8859-1",
"ProfileId":"${profileId}",
"LanguageLocaleKey":"en_US",
"IsActive":true,
"FederationIdentifier":"${user?.getEmail()}"
}

Alias should print as below.

if users last name length is greater than or equal 4
Firstname: Queng
lastname:richard
Alias: qrich

if users last name length is less than 4 characters
Firstname: Queng
lastname:Le
Alias: qle

i have observed that if users last name is less than the 4 characters pending tasks are not completed with exception

Error in creating user= String index out of range:4

[naveenss]

Hi @SumathiSomala  please find the below logic for Alias. Please make the necessary changes as per your requirement.

"Alias": "${if(user?.lastname!=null && user?.lastname.length()>=4){user?.lastname.toLowerCase().substring(0,4)}else if(user?.lastname!=null && user?.lastname?.length()<4){user?.lastname.toLowerCase()}}",

Let me know if this helps!

[SumathiSomala · Accepted solution]

Thank you @naveenss 

I made small change to this as per my requirement. It is working as excepted. 

"Alias": "${if(user?.lastname!=null && user?.lastname.length()>=4){user?.firstname.toLowerCase().substring(0,1)+user?.lastname.toLowerCase().substring(0,4)}else if(user?.lastname!=null && user?.lastname?.length()<4){user?.firstname.toLowerCase().substring(0,1)+user?.lastname.toLowerCase()}}",

Just wanted to know what the difference is between user.lastname and user?.lastname

[naveenss · Accepted solution]

@SumathiSomala thanks for confirming. 

In user?.lastname, the ? operator is used for null check. This is a groovy shorthand to avoid any null pointer exceptions.