## 实现一个基于二分查找的整形数组查找

```typescript
const indexOf_BinarySearch = (dataArr: number[], num: number): number => {
	let n1 = 0;
	let n2 = dataArr.length - 1;
	if (n1 === num) return n1;
	if (n2 === num) return n2;

	while (n1 <= n2) {
		const mid = Math.floor((n1 + n2) / 2);
		if (num > dataArr[mid]) {
			n1 = mid + 1;
		} else if (num < dataArr[mid]) {
			n2 = mid - 1;
		} else {
			return mid;
		}
	}

	return -1;
};
```

## 两数之和