isDigits

1/**
2 * Checks if a string contains only digit characters (0-9).
3 *
4 * @param str - The input string to validate.
5 * @returns True if the string contains only digits, false otherwise.
6 */
7export function isDigits(str: string): boolean {
8  return /^\d+$/.test(str);
9}

1test('isDigits - returns true for digits only', () => {
2  expect(isDigits('123456')).toBe(true);
3});
4
5test('isDigits - returns false for string with letters', () => {
6  expect(isDigits('123a456')).toBe(false);
7});
8
9test('isDigits - returns false for empty string', () => {
10  expect(isDigits('')).toBe(false);
11});
12
13test('isDigits - returns false for spaces and digits', () => {
14  expect(isDigits(' 123 ')).toBe(false);
15});
16
17test('isDigits - returns false for symbols with digits', () => {
18  expect(isDigits('123-456')).toBe(false);
19});