function pickPeaks(arr) {
    let pos = [];
    let peaks = [];

    for (let i = 1; i < arr.length - 1; i++) {
        if (arr[i] > arr[i - 1] && arr[i] > arr[i + 1]) {
            pos.push(i);
            peaks.push(arr[i]);
        } else if (arr[i] > arr[i - 1] && arr[i] === arr[i + 1]) {
            let plateauStart = i;
            while (arr[i] === arr[i + 1]) {
                i++;
            }
            if (arr[i] > arr[i + 1]) {
                pos.push(plateauStart);
                peaks.push(arr[plateauStart]);
            }
        }
    }

    return { pos, peaks };
}

// Test cases
console.log(pickPeaks([
  14,  0, 13,  8, 12, 13,
  13, 15, -4, 10, 14,  4,
  13
])); 


// 13
// 15
// 14

//  6
//  3
if (arr[i] > arr[i -1] && arr[i] > arr[i + 1]){
    peaks.push(arr[i]);
    pos.push(i);
}