162. Find Peak Element.js

// A peak element is an element that is strictly greater than its neighbors.

// Given a 0-indexed integer array nums, find a peak element, and return its index. If the array contains multiple peaks, return the index to any of the peaks.

// You may imagine that nums[-1] = nums[n] = -∞. In other words, an element is always considered to be strictly greater than a neighbor that is outside the array.

// You must write an algorithm that runs in O(log n) time.

// Example 1:

// Input: nums = [1,2,3,1]
// Output: 2
// Explanation: 3 is a peak element and your function should return the index number 2.
// Example 2:

// Input: nums = [1,2,1,3,5,6,4]
// Output: 5
// Explanation: Your function can return either index number 1 where the peak element is 2, or index number 5 where the peak element is 6.

const findPeakElement = nums => nums.indexOf(Math.max(...nums))