Need a character from one string (for example 'd' ) to be equal to a digit from 0 to 9 from another string and output True?

Question

JavaScript

If the i-th position of the line contains the character 'd', then the 2nd line must contain the digit 0 - 9 at the same position. Preferably without a direct answer

Answer 1

No direct answer:
indexOf
charAt
===
and
parseInt
>
<
or
RegExp
test