Leetcode 1752 - Check if Array Is Sorted and Rotated | JavaScript Solution

Published: 12 January 2026
on channel: Web Coder Abhishek

183

In this video, solve LeetCode 1752: Check if Array Is Sorted and Rotated with a simple and elegant JavaScript solution.

Given an array nums, return true if it was originally sorted in non-decreasing order and then rotated some number of positions (including zero). Otherwise, return false. Duplicates allowed.

Key insight: A rotated sorted array has exactly zero or one position where nums[i] grearer than nums[(i+1) % n] (circular comparison).
You’ll learn:
Why only one rotation point (or zero) means it’s valid
Circular array comparison with moduloO(n) time, O(1) space solutionJavaScript implementation with edge cases and dry runs

📌 Examples:
[3,4,5,1,2] → true (rotated from [1,2,3,4,5])[2,1,3,4] → true (rotated from [1,2,3,4])[1,2,3,4] → true (no rotation)[1,4,3] → false (two rotation points)

Perfect for array validation, circular arrays, and Top Interview 150 prep in JavaScript.

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Keywords:
leetcode 1752
sorted and rotated array
javascript solution
rotated sorted array
one rotation point
circular array check
js coding interview
dsa javascript
validate rotation
modulo comparison js

Hash tags:- #leetcode #javascript #dsa #coding #programming #reactjs

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