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feat: add palindrome number algorithm #1978

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feat: add palindrome number algorithm #1978

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23 changes: 23 additions & 0 deletions Maths/PalindromeNumber.js
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/**
* @function isPalindromeNumber
* @description Checks whether a given integer is a palindrome.
* A palindrome number reads the same forwards and backwards.
* Negative numbers are not palindromes.
* @param {number} n - An integer
* @returns {boolean} - True if n is a palindrome number, false otherwise
* @see https://en.wikipedia.org/wiki/Palindromic_number
* @example isPalindromeNumber(121) => true
* @example isPalindromeNumber(1221) => true
* @example isPalindromeNumber(-121) => false
* @example isPalindromeNumber(123) => false
*/
const isPalindromeNumber = (n) => {
if (!Number.isInteger(n)) {
throw new TypeError('Input must be an integer')
}
if (n < 0) return false
const str = String(n)
return str === str.split('').reverse().join('')
}

export { isPalindromeNumber }
43 changes: 43 additions & 0 deletions Maths/test/PalindromeNumber.test.js
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import { isPalindromeNumber } from '../PalindromeNumber.js'

describe('isPalindromeNumber', () => {
test('121 is a palindrome number', () => {
expect(isPalindromeNumber(121)).toBe(true)
})

test('1221 is a palindrome number', () => {
expect(isPalindromeNumber(1221)).toBe(true)
})

test('12321 is a palindrome number', () => {
expect(isPalindromeNumber(12321)).toBe(true)
})

test('0 is a palindrome number', () => {
expect(isPalindromeNumber(0)).toBe(true)
})

test('1 is a palindrome number', () => {
expect(isPalindromeNumber(1)).toBe(true)
})

test('123 is NOT a palindrome number', () => {
expect(isPalindromeNumber(123)).toBe(false)
})

test('10 is NOT a palindrome number', () => {
expect(isPalindromeNumber(10)).toBe(false)
})

test('negative numbers are NOT palindromes', () => {
expect(isPalindromeNumber(-121)).toBe(false)
})

test('throws TypeError for float input', () => {
expect(() => isPalindromeNumber(1.5)).toThrow(TypeError)
})

test('throws TypeError for string input', () => {
expect(() => isPalindromeNumber('121')).toThrow(TypeError)
})
})
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