Binary Search in TS

binary_search.ts

function binarySearch<T>(values: T[], compare: (v: T) => number): number {
  let left = 0;
  let right = values.length - 1;
  let ans = -1;
  while (left <= right) {
    const mid = Math.floor(left + (right - left) / 2);
    const comp = compare(values[mid]!);
    if (comp === 0) {
      return mid;
    }
    if (comp < 0) {
      left = mid + 1;
      ans = mid + 1;
    } else {
      ans = mid;
      right = mid - 1;
    }
  }
  return ans;
}