findMostFrequent.js

async function findMostFrequent(array, blackListArr)
{
    if(array.length == 0)
        return null;
    var modeMap = {};
    var maxEl = array[0], maxCount = 1;

    // First go through blackList array and set maxEl to the first element that isn't in the blacklist, if every of the numbers in the array is in the blacklist, then just return generateRandom

    var containsValidNumbers = false;
    for(var i = 0; i < array.length; i++) {
      if(!blackListArr.includes(array[i])) {
        maxEl = array[i];
        containsValidNumbers = true;
        break;
      }
    }
    if(!containsValidNumbers) return await generateRandom(blackListArr);

    for(var i = 0; i < array.length; i++)
    {
        var el = array[i];
        if(blackListArr.includes(el)) continue;
        if(modeMap[el] == null)
            modeMap[el] = 1;
        else
            modeMap[el]++;  
        if(modeMap[el] > maxCount)
        {
            maxEl = el;
            maxCount = modeMap[el];
        }
    }
    await addToBlackList(maxEl);
    return maxEl;
    
}