Check for vowels in a string in javascript

vowels.js

const input = 'Hello World';
const filterArr = ['a','e','i','o','u'];

let counted = getCountFromFilteredInput(input,filterArr);
// 3
console.log(counted.length);
// ["e", "o", "o"]
console.log(counted);
// Passed
if (assertSame(counted.length, 3)) {
	console.info('Passed');
}

// assertions test
function assertSame(x,y) {
	if (x===y) {
  	return true;
  }
  console.error('Failed assertion. Expected: ', x, ' to be: ', y);
  return false;
}

// main function
function getCountFromFilteredInput(inputString, filterArr) {
	let count = 0;
  const inputStringSplit = inputString.split('');
  
  const checkerFunc = value =>
  filterArr.some(element => value.includes(element));

	return inputStringSplit.filter(checkerFunc);
}