function countValuesInRange(arr, from, to) {
let count = 0;
const size = arr.length;
for (let i = 0; i < size; i++) {
if (arr[i] >= from && arr[i] <= to)
count++;
}
return count;
}
const arr = [ 3, 6, 0, 17, 9, 1, 8, 7, 4, 10, 18, 11, 20, 3 ];
const from = 5, to = 12;
console.log(countValuesInRange(arr, from, to));
/*
run:
6
*/