<script>
var arr = [12, 34, 37, 56, 67, 78, 89, 90, 99]
function search(arr, key) {
let low = 0;
let high = arr.length - 1;
while (low <= high) {
let mid = parseInt((high + low) / 2);
if (arr[mid] == key) {
return mid;
} else if (arr[mid] > key) {
high = mid - 1;
} else {
low = mid + 1;
}
}
return -1;
}
console.log(search(arr, 34));
</script>