Good afternoon! Here's our prompt for today.

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

Consider that we are given a list of numbers, such as the following:

[1, 2, 3, 1]

Determine the peak element of this list, and return its index. If the array contains multiple peaks, return the index to any of the peaks.

Constraints

• 1 <= nums.length <= 1000
• -2³¹ <= nums[i] <= 2³¹ - 1
• nums[i] != nums[i + 1] for all valid i.

Try to solve this here or in Interactive Mode.

How do I practice this challenge?

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var assert = require('assert');

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function find_peak_element(arr) {

    //fill this in

}

​

try {

    assert.equal(find_peak_element([1, 2, 3, 1]), 2);

​

    console.log('PASSED: ' + "assert.equal(find_peak_element([1,2,3,1]), 2)");

} catch (err) {

    console.log(err);

}

​

try {

    assert.equal([1, 5].includes(find_peak_element([1, 2, 1, 3, 5, 6, 4])), true);

​

    console.log('PASSED: ' + "assert.equal([1, 5].includes(find_peak_element([1, 2, 1, 3, 5, 6, 4])), true)");

} catch (err) {

    console.log(err);

}

​

Here's our guided, illustrated walk-through.

How do I use this guide?