lambda_appian_internal

Question

Hi, 
 I am searching the usage of lambda_appian_internal() function. 
 I have not used it earlier and any insights would be helpful on this. 
 
 Thanks 
 Rohini

Dharmendra Godhani · Answer

Hi Rohini, 
 lambda_appian_internal is similar to lambda expressions in java. 
 
 In my case it helped me to create a dictionary in a single rule.Here i am attaching the simple example to understand the functionality. 
 
 load( local!employeeDetails:{ {id:1,firstName:"A",lastName:"B"}, {id:2,firstName:"P",lastName:"Q"}, {id:3,firstName:"X",lastName:"Y"} }, local!callLambdaFunction:lambda_appian_internal( ri!details, { id:tointeger(index(ri!details,"id",0))+1, name:concat(index(ri!details,"firstName",null) ," ",index(ri!details,"lastName",null)) } ), a!forEach( local!employeeDetails, local!callLambdaFunction(fv!item) ) 
 ) 
 
 Let me know if you need further help on this. 
 
 Thanks 
 Dharmendra

gianninol · Answer

Rohini, 
 
The above answers are correct regarding the function of lambda_appian_internal in that it is a way to re-use an expression without creating an expression rule. What I have not seen mentioned yet, though, is that there is a reason that the function is undocumented and has "appian_interal" at the end. It is meant to be used as a piece of Appian's internal architecture only. It is not recommended to use it in your applications, as it is not guaranteed to work as you would expect in every scenario.

namratak356 · Answer

Hi Rohini, 
 
Lambda expressions are introduced in Java 8 and are touted to be the biggest feature of Java 8.Lambda expressions are used primarily to define inline implementation of a functional interface.Lambda expression eliminates the need of anonymous class and gives a very simple yet powerful functional programming capability to Java. 
Appian utilises lambda_appian_internal() funtion to achieve above funtionality. 
 
Thanks 
Namrata