JavaScript Challenge - Calculate the Mean and Mode, Calculate the Mean and Mode

FAQ
#44 
function statsFinder(array) {
  // Write your code here
  const mn = array.reduce((i, n) => i + n) / array.length;
  const o = {};
  array.forEach(n => o[n] ? o[n]++ : o[n] = 1);
  const ms = parseInt(Object.keys(o).reduce((a, b) => o[a] > o[b] ? a : b));
  return [mn, ms];
}

console.log(statsFinder([500, 400, 400, 375, 300, 350, 325, 300]))

// Leave this so we can test your code:
module.exports = statsFinder;
#45 
function findMapMax(map) {
  let maxValue = 0;
  let maxKey = 0;
  map.forEach((value, key) => {
    if (value > maxValue) {
      maxValue = value;
      maxKey = key;
    }
  })
  return maxKey;
}

function statsFinder(array) {
 const meanAndMode = array.reduce((a,b) => {
   a["mean"] += b;
   a["mode"].set(b, a["mode"].has(b) ? a["mode"].get(b) + 1 : 1);
   return a;
 }, {"mean" : 0, "mode" : new Map()});

 return [
   meanAndMode["mean"] / array.length,
   findMapMax(meanAndMode["mode"])
 ]
}

console.log(statsFinder([500, 400, 400, 375, 300, 350, 325, 300]))

// Leave this so we can test your code:
module.exports = statsFinder;
#46 
function statsFinder(array) {
  // Write your code here
  let meanAndMode = []
  const mean = array.reduce((a,b) => (a + b)) / array.length;
  const mode = array.find((i, index) => {
    return array.lastIndexOf(i) != index;
  })

  meanAndMode.push(mean, mode)

  return meanAndMode;
}

console.log(statsFinder([500, 400, 400, 375, 300, 350, 325, 300]))

// Leave this so we can test your code:
module.exports = statsFinder;