Searching for a value in the table: 1 if found, 0 if not found. Is it possible to?

Question

JavaScript

We managed to find only two functions that look up a value in an array:
1) VLOOKUP
2) MATCH
Both functions return some #N/ A value if they cannot find the value they are looking for in the table. And nothing can be done about this #N/A. How to turn it into zero?
PS I mean exact search (by coincidence), not approximate (when some closest value is selected).

Answer 1

Make the class not .prod1 and .prod2, but just .prod, add the data-num attribute and fse:

$('.prod').click(function(){
var num = $(this).attr('data-num');
    $('.product-'+num).addClass('hidden');
    $('.product-md-'+num).removeClass('hidden');
});

Answer 2

Here's an Error
Handler