Javascript - Add many numbers (Variables)

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Hello !...

I'm working on a game project and I have a strange issue...

I'm collecting numbers in TEB (and saved them as variables named "D1_1", "D1_2", ... , "D1_6")

And I want to add these 6 variables, the result would be another variable ("Total_1")...

(Of course I can add them using the Captivate's Expression action but it would add more variables, need 5 actions... So I wanted to use Javascript !...)

And to add these 6 variables with Javascript it would need  just a line of code :

Total_1 = D1_1 + D1_2 + D1_3 + D1_4 + D1_5 + D1_6;

After having a problem (my variables considered as string and not as numbers), I looked in Js ressources on Internet and found that I have to add :

Number(Total_1);

And it seems to be ok :

But If I let one TEB without answer, the same problem (string and number) occurs :

So... I need your help !

(I already found a solution by adding the default text of "0" in the TEB... But I would  prefer that the TEBs were cleared...)

Thanks in advance !...

😉

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Edit : I forget to precise that I affect all these variables with "0" when entering the slide...

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