reverse

1/**
2 * Reverses the characters in a string.
3 *
4 * @param str - The input string to reverse.
5 * @returns A new string with characters in reverse order.
6 */
7export function reverse(str: string): string {
8  return str.split('').reverse().join('');
9}

• Simplicity and Clarity

  Very concise and easy to understand implementation using built-in string and array methods.

• Non-Destructive

  Returns a new string without mutating the original, preserving functional programming principles.

• Wide Applicability

  Can be reused across various types of string manipulation needs, from basic tasks to more complex transformations.

• Consistent Output

  Handles standard strings reliably regardless of input content, including whitespace and symbols.

Tests | Examples

1test('reverse - normal string', () => {
2  expect(reverse('hello')).toBe('olleh');
3});
4
5test('reverse - empty string', () => {
6  expect(reverse('')).toBe('');
7});
8
9test('reverse - single character', () => {
10  expect(reverse('a')).toBe('a');
11});
12
13test('reverse - palindrome string', () => {
14  expect(reverse('madam')).toBe('madam');
15});
16
17test('reverse - with numbers and symbols', () => {
18  expect(reverse('123!abc')).toBe('cba!321');
19});

Common Use Cases

• Palindrome Checking

  Reverse the string and compare it with the original to check if it’s a palindrome.

• Text Animations or Effects

  Used in UI/UX for mirroring or reversing text dynamically (e.g., reversing typing animation).

• Encoding or Obfuscation

  Simple form of text obfuscation for puzzle games or non-secure encoding scenarios.

• Data Entry Validation

  Compare reversed versions of values for validation or formatting (e.g., IBAN or credit card checks).

• CLI and Debugging Tools

  Display reversed output for command-line utilities or logging in reverse-chronological order.