code: function closestToZero(numbers, maxNumber) {
      //returns the index of value closest to 0
      var positiveNumbers = numbers.map(function(number) {
          return Math.abs(number);
      });
  
      var sortedPositiveNumbers = positiveNumbers.sort(function(a, b) {
          return (a - b);
      });
  
      return sortedPositiveNumbers[0];
  }
docs: Return the number that's closest to zero