meanMode.js

/* https://coderbyte.com/question/mean-mode

*  Have the function MeanMode(arr) take the array of numbers stored in arr and         *
*  return 1 if the mode equals the mean, 0 if they don't equal each other              *
*  (ie. [5, 3, 3, 3, 1] should return 1 because the mode (3) equals the mean (3)).     *
*  The array will not be empty, will only contain positive integers, and will not      *
* contain more than one mode.                                                          *
*                                                                                      *
*  SOLUTION                                                                            *
*  Since it is possible that I will want a function that will calculate the mean or    *
*  mode in the future, I decided to create separate functions for each. The mean is    *
*  calculated by the average of all values in the array. The mode is the number that   *
*  exists the most in the array. My solution is to call my two functions and then      *
*  compare to see if they are equal and if so return 1 else return 0.                  *
*                                                                                      *
*  Steps for solution                                                                  *
*    1) Create separate functions for getMean and getMode                              *
*    2) Compare the values returned from the two functions                             *
*    3) If values are equal return 1 else return 0
*/

mean = arr => (arr.reduce((a, b) => a + b))/(arr.length);

// mode is just the problem of finding the element with greatest no of occurrence
mode = arr => {

    let obj = {}, max = 1, mode;

    for (let i of arr) {
        obj[i] = obj[i] || 0;
        obj[i]++
    }

    for (let i in obj) {
        if (obj.hasOwnProperty(i)) {
            if ( obj[i] > max ) {
                max = obj[i]
                mode = i;
            }
        }
    }
    return mode;
}

meanMode = arr => mean(arr) == mode(arr)

let myArr = [5, 3, 3, 3, 1]

console.log(mean(myArr))

console.log(mode(myArr))

console.log(meanMode(myArr))