JavaScript: compare array and return a score using array.map

JSArrayMapForScore.js

function compareTriplets(a, b) {
  	let score1, score2, iter;
  	score1 = score2 = iter = 0;
    a.map(item => {
      if (item > b[iter]) {
        score1++;
      }
      if ( item < b[iter]) {
        score2++;
      }
      iter++;
    });
    return [score1, score2];
}
console.log(compareTriplets([1,2,3], [6,1,2]));