How to do an IN operation using tMap expression

[TY3]

I want to do an IN condition in tMap expression i.e. check if the value of a column falls in a list of values.

e.g. my input row contains a column STATE and i want to allow data belonging to only certain states, let's say CA, NY and NC, to flow downstream as ouput from tMap.

I know i can do something like this in tMap expression filter

row1.STATE =="CA" || row1.STATE =="NY" || row1.STATE =="NC" .

I actually do not want to hardcode my list in the expression, but,  instead pass them as a context variable. Also, my list of values is not constant; it can go up or down.

So, i was wondering if there is something like

row1.STATE in (context.desired_states) that i can do where i can set the value of context variable desired_states as "NY","CA",'WA" . This gives flexibility to change the list by just updating the context variable value instead of chaging the code everytime i want to add or remove a value from the list.

[TRF · Accepted solution]

As soon as you have a context variable with valid states such as "NY","CA",'WA" you can use the following expression:
context.desired_states.contains("\"" + row1.STATE + "\"")