Using a string as an If statement expression

Question

I am creating dynamic code so I am creating a string that I would like to use as the expression inside an if statement.

if (string) {

}

The string that i have created will have to act as the "literal code". Does anyone know of a way to do this?

Answer 1

It is true that there is no substitute for eval() in APEX however there does exist a workaround. The workaround is to prepare a string and execute it as "anonymous block" and parse the results.

Check this blog post which shows how this could be achieved http://codefriar.com/2014/10/30/eval-in-apex-secure-dynamic-code-evaluation-on-the-salesforce1-platform/

Answer 2

I have restructured my project so that I will b able to avoid this type of problem. I will not be able to run the expression when i pull the data from the SOQL. Thank you for the answers

Answer 3

If statements evaluate boolean expressions, which can be stored as a boolean value and passed on to the if statement through a variable.

An example method:

public doSTuff(List<object>data, boolean condition){
    if(condition){
         //do stuff to data
    }
}


//somewhere else
 List<sobject> = [SOQL..]; //dummy code
boolean condition =  param1 > data.size(); //dummy boolean expression
doStuff(data,condition); //passing your boolean expression to the method


//somewhere else 2
List<sobject> = [SOQL..]; //dummy code
boolean condition =  param1 <= data.size(); //different boolean expression
doStuff(data,condition); //same method!

Answer 4

You can not do this in apex, but in javascript, you can use 'eval' method to execute literal code. As an alternative, you can pass literal code to javascript, then run it.