meanMedianMode.js

function meanMedianMode(array) {
  return {
    mean: getMean(array),
    median: getMedian(array),
    mode: getMode(array)
  };
}

function getMean(array) {
  let sum = 0;
  
  array.forEach( num => {
    sum += num;
  })

  let mean = sum/array.length;

  console.log(mean);
  return mean;
}

function getMedian(array) {
  array.sort(function(a, b) {return a-b});
  let median;

  if(array.length%2 !== 0) {
    median = array[Math.floor(array.length/2)];
  } else {
    let mid1 = array[(array.length/2) - 1];
    let mid2 = array[(array.length/2)];

    median = (mid1 + mid2)/2;

    console.log(median);
    return median;
  }
}

function getMode(array) {
  let modeObj = {};
  
  array.forEach( num => {
    if(!modeObj[num]) modeObj[num] = 0;
    modeObj[num]++;
  });

  let maxFrequency = 0;
  let modes = [];
  for(let num in modeObj) {
    if(modeObj[num] > maxFrequency) {
      modes = [ num ];
      maxFrequency = modeObj[num];
    }
    else if (modeObj[num] === maxFrequency) modes.push(num);
  }

  if(modes.length === Object.keys(modeObj).length) modes = [];

  console.log(modes);
  return modes;
}



meanMedianMode([9, 10, 23, 10, 23, 9]);