I have AngularJs on client-side and Servlets on server-side.I want to 
manipulate my JSON data on client after performing some actions on the 
server. 

Suppose I have my Json data as

var obj={"num1":20,"num2":5}

Currently before sending my data (doPost) to server I attach a information 
about which operation I want to perform like this

var data_to_send ={
    "operation":"Add",  //"Mul" for multiply "Sub" for subtract etc
    "data":obj  } 

After receiving my data on server I see my "operation" and send the "data" 
accordingly to the specific function and at last send 
manipulated/caluclated data back to client.

Doing this is very tedious as I have many functions so I want to avoid 
if-else ladder. Is their any way around? Can I send data to specific 
function directly?

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