Sort and print number of occurences of random numbers - arrays

Question

const randomNum = [];
for (let i = 0; i <= 20; i += 1) {
randomNum.push(Math.floor(Math.random() * 20 + 1));
}
then
function getOccurrence(array, value) {
return array.filter((x) => x === value).length;
}
My goal is to print out something along the line of
Number 1, 6, 12, 3, 9 occurred 1 times.
Number 2, 5, 7, 19, 17 occurred 2 times.
Number 15, 11 occurred 3 times.
And so on.
Any idea how i should go about this?
I was thinking of making a function, something along the line of
function numberOccurrence(arr, arrLength){
}
So i in the future could feed it ANY array with with x amount of numbers in it, but I'm unsure how to go forward.
I've tried multiple .includes, .indexOf, ifs and so forth, but i feel stuck, could anyone give me a push in the right direction?
I feel like having a loop which counts how many times 1 occurs, then saves that into an object like this
numObj = {
1: 2,
2: 1,
3: 4,
}
Where the object is built as soon as the function runs, and it builds it based on the arrLength parameter i feed the function in the beginning.
Anything is appreciated, thank you!
Update:
I manage to SOMETIMES print part of the answer right with this:
function getOccurrence(array, value) {
return array.filter((x) => x === value).length;
}
for (let i = 1; i <= randomNum.length; i += 1) {
let numOccurr = [];
for (let j = 1; j <= randomNum.length; j += 1) {
if (randomNum.includes(j)) {
if (getOccurrence(randomNum, j) === i) {
numOccurr.push(j);
if (j === randomNum.length) {
printOut(`Number: ${numOccurr.join(', ')} occurrs ${i} times.`);
numOccurr = [];
}
}
}
}
}
if i check my array after "Number: 20 occurred 4 times" gets printed, i see that the answer is correct, problem is, sometimes it prints every number generated 1 time, then sometimes only those generated 2 times, and so on. And sometimes nothing gets printed

Answer 1

SOLVED:
This code worked for me
const randomNum = [];
for (let i = 0; i < 20; i += 1) {
randomNum.push(Math.floor(Math.random() * 20 + 1));
}
function getOccurrence(array, value) {
return array.filter((x) => x === value).length;
}
for (let i = 1; i <= randomNum.length; i += 1) {
const numOccurr = [];
for (let j = 1; j <= randomNum.length; j += 1) {
if (randomNum.includes(j)) {
if (getOccurrence(randomNum, j) === i) {
numOccurr.push(j);
}
}
}
if (numOccurr.length !== 0)
printOut(`Number: ${numOccurr.join(', ')} occurred ${i} times.`);
}