How to update a object without a new variable.

Question

I have a list like {1,2,3,4}, I want to add new items like {1,2,3,4,5,6,.....} in the same list without using a new variable to store the new list.

Stefan Helzle · Accepted Answer

Appian expressions follow a functional paradigm. Variables are immutable.

Shubham Aware · Answer

In Appian Variables are designed to be permanent once created - you can't alter them after initialization. To make changes, you must build a brand new variable that incorporates your modifications while leaving the original intact. Hope you are expecting this when you want to append list... a!localVariables(
 local!originalList: { 1, 2, 3, 4 },
 local!listToAppend: { 5, 6, 7, 8, 9, 10 },
 { local!originalList, local!listToAppend }
)

Harsha Sharma · Answer

you can use append() function if you want t add at the end of list always or use insert function if you want to insert at specific indices/index 
 
 insert({1,2,3},{4,5,6},4)

append({1,2,3},{4,5,6})

Harsha Sharma · Answer

If you want to update the same variable then try manipulating the list inside saveinto of a interface component and keep the target also there same variable. Eg 
 a!save(ri!value, append(ri!value,{4,5}) 
 Similarly in process models output tabs within nodes allows to perform operations on a list and saveinto the same original variable. Apart from this, without using any variables in picture, there is no way to perform operations and keep it stored or pass along in processes!

How to update a object without a new variable.

Top Replies