Filters out null and undefined values from an array

filter-empty.ts

/**
 * Filters out null and undefined values from an array.
 *
 * @template T - The type of the array elements.
 * @param {Array<T | null | undefined>} arr - The array to be filtered.
 * @returns {Array<T>} - A new array with null and undefined values removed.
 *
 * @example
 * const fruits = ['apple', null, 'banana', undefined, 'cherry'];
 * const validFruits = filterEmpty(fruits);
 * console.log(validFruits); // Output: ['apple', 'banana', 'cherry']
 */
export function filterEmpty<T>(arr: Array<T | null | undefined>): Array<T> {
  return arr.flatMap((item) => (item != null ? [item] : []));
}