var repeatNumbers = function(data) {
  return data.map(([number, count]) => number.toString().repeat(count)).join(', ')
}
console.log(repeatNumbers([[1, 10]]));
console.log(repeatNumbers([[1, 2], [2, 3]]));
console.log(repeatNumbers([[10, 4], [34, 6], [92, 2]]));
// using map function to create new array and including other functions like "toString" to make into string and "join" to combine the other arrays together witha a comma.