37. implement Binary Search (unique)

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from all members: - accepted / - tried

Even in Front-End review, basic algorithm technique like Binary Search are likely to be asked.

You are given an unique & ascending array of integers, please search for its index with Binary Search.

If not found, return -1


Please don't use Array.prototype.indexOf(), it is not our goal.

Let's try to solve this problem within 10 mintues.