Javascript “Variable Variables”: how to assign variable based on another variable?

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Looks like an array to me, or am I missing something? 

var counters = [0,0,0];

function process(index) {
   ++counters[index]; 
      /* or ++counters[index]+index, not sure what you want to do */
   if (counters[index] === 13) { 
      /* do stuff */ 
   }
}

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