How to fix undefined error when accessing a variable in HTML?

Question

JavaScript

I have an object and when accessing a value in html, I get an error:

TS:

HTML:

Line 30, if instead of ['persons_'+i+1] I just write ['persons_1'], then it does not give an error, but when dynamically accessed, an error appears

Answer 1

I'll correct you:
Line 30, if instead of ['persons_'+i+1] you write ['persons_'+(i+1)], then it does not give an error, (well, or there is 1 extra)