function getDifference(arrA, arrB) {
	return arrA.filter(a => !arrB.includes(a));
}
Creates an array with elements from the first given array that are not included in the second given array.
@param {Array} arrA The array to compare from.
@param {Array} arrB The array to compare against.
@returns {Array} a new array that represents `arrA \ arrB`.