Concatenating two trial epochs without code duplication

[fspinar]

Hello dear JsPsych community,

I have a question regarding modularity of task / task epoch codes. Lets say I want to combine two different trial epochs within a single trial. This can be as simple as :
fixation + choice + outcome ;
or more complicated :
fixation + choice 1 + choice 2 + outcome.
Lets say I have my custom plugins for implementing :
fixation + choice 1 + outcome and
fixation + choice 2 + outcome.
Now, in order to make the new custom plugin :
fixation + choice 1 + choice 2 + outcome,
do I need to duplicate my codes from the other plugins ?
I was thinking if there are better ways to achieve this using jspsych functionalities.
One way I can think is to implement functionalities of different trial epochs in different classes, and then use them within plugins ; which would solve the problem.
E.g., class 1 for choice 1 ; class 2 for choice 2 ; and then use the functions of the classes within my plugins.

Is there a way to achieve something like this using jspsych without requiring to write my own classes ?

Sorry if this is confusing...

Thanks a lot !

[Shaobin-Jiang]

Why don't you use a timeline instead? Create a timeline like [fixation, choice_timeline, outcome], where choice_timeline is a child timeline that contains your choice trials. You can then use timeline variables for that child timeline.

[fspinar]

Yes I guess I could do that. But then is the data obtained from running [fixation, choice_timeline, outcome] timeline going to be like a single-trial data ? I want to be able to have the data obtained from my trial in a single trial object, and I am not sure if this is the case when we create a timeline like this.

Thank you !!

[Shaobin-Jiang]

No. The data would be scattered across trials. But it would not be too difficult to put them together. You can add an on_finish event for outcome and add the data from previous trials to the data object collected in the current trial.