Getting values higher than average in Array - JS

Question

I'm trying to get all the numbers that are higher than the average of a given Array. (this goes into an HTML page so it's with document.write this is what I wrote:

sumAndBigger(arrayMaker());

function sumAndBigger(array) {
  for (i = 0; i < array.length; i++) {
    sum += array;
  }
  var equalAndBigger = []
  var avg = sum / array.length;
  for (i = 0; i < array.length; i++) {
    if (array[i] > avg) {
      equalAndBigger.push(array[i])
    }
  }
  document.write('The numbers are: ' + equalAndBigger)
}

function arrayMaker() {
  var array = [];
  for (i = 0; i < 5; i++) {
    var entrie = +prompt('Enter a number: ');
    array.push(entrie)
  }
  return array;
}

This doesn't seem to work.. what am I doing wrong here?

Thanks in advance!

sum += array; wat? sum isn't declared, and adding the array object makes no sense to me. You probably meant to declare sum before the loop, and use sum += array[i];. Also, the singular of "entries" is "entry". — ASDFGerte
– ASDFGerte, Commented Dec 15, 2019 at 19:15
JSYK, you should avoid document.write: stackoverflow.com/questions/802854/… — iPhoenix
– iPhoenix, Commented Dec 15, 2019 at 19:16
PS: you also never declare i in any of your loops. This only works in non-strict, and is not a good habit to pick up. — ASDFGerte
– ASDFGerte, Commented Dec 15, 2019 at 19:26

tbhaxor · Accepted Answer · 2019-12-17 09:37:31Z

2

Ok so here I am giving you a one-liner code to get all the elements from the array that are "strictly greater than" the average value

let array = [1, 2, 3, 4, 5]
let allNums = array.filter(v => v > array.reduce((x, y) => x + y) / array.length);

Explanation

array.reduce((x, y) => x + y) → sum of all elements in the array
array.reduce((x, y) => x + y) / array.length → getting the average

Output

[4, 5]

MORE DETAILED CODE

function getAverage(arr) {
  let sum = 0;

  for (let i = 0; i < arr.length; i++) {
    sum += arr[i];
  }
  return sum / arr.length;
}

function getGreaterThanAverage(arr) {
  let avg = getAverage(arr);
  let numbers = [];

  for (let i = 0; i < arr.length; i++) {
    if (arr[i] > avg) {
      numbers.push(arr[i]);
    }
  }

  return numbers;
}

edited Dec 17, 2019 at 9:37

answered Dec 15, 2019 at 19:29

tbhaxor

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1 Comment

ASDFGerte Over a year ago

Resisting the urge to make one liners, and caching the average, would make this considerably better.

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