How to set variable variable like PHP in JS?

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  I just can't get it to the next one:
  There is a need to organize nesting in js to fill out a huge table form without reloading the page. The problem is this: the first level is easy - ABCD ... Z. Then the problems begin. To make nesting like AaAb, BaBb ... ZaZb, then you need to somehow loop through the alphabet for each letter. Hence the question: how to set a variable so that for each letter it preserves the sequence a-z and does not intersect.
  
  For one letter:
  

  var Possibleletters = 'abcdefghijklmnopqrstuvwxyz';
  var currLetter = 'a';
  id - буквы от A до Z
  function add(id,level){
          var nextIndex = Possibleletters.indexOf(сurrLetter) + 1;
          сurrLetter = Possibleletters[nextIndex];
       дальше уже пофик  
      };

  JavaScript Colin Koch, May 8, 2019

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1 Answers
• 0
  for such purposes and those that use maps and sets even better

  Arabella Skinner

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