solutions/2951-find-the-peaks.js

/**
 * 2951. Find the Peaks
 * https://leetcode.com/problems/find-the-peaks/
 * Difficulty: Easy
 *
 * You are given a 0-indexed array mountain. Your task is to find all the peaks in the
 * mountain array.
 *
 * Return an array that consists of indices of peaks in the given array in any order.
 *
 * Notes:
 * - A peak is defined as an element that is strictly greater than its neighboring elements.
 * - The first and last elements of the array are not a peak.
 */

/**
 * @param {number[]} mountain
 * @return {number[]}
 */
var findPeaks = function(mountain) {
  const result = [];

  for (let i = 1; i < mountain.length - 1; i++) {
    if (mountain[i] > mountain[i - 1] && mountain[i] > mountain[i + 1]) {
      result.push(i);
    }
  }

  return result;
};