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feat: add harshad number check algorithm#1801
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ded2ec2 feat: check if number is a harshad number
ridge-kimani3a5666b Updated Documentation in README.md
ridge-kimani18f5789 chore: rename file
ridge-kimani9fa5a04 Updated Documentation in README.md
ridge-kimani548fe75 chore: update argument values
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| /** | ||
| * Wikipedia: https://en.wikipedia.org/wiki/Harshad_number | ||
| * A Harshad number (or Niven number) is a positive integer that is divisible by the sum of its own digits. | ||
| * | ||
| * The function checks if a number is a Harshad (Niven) number. | ||
| * @param {any} val - The number to check | ||
| * @returns {boolean} - true if Harshad, false otherwise | ||
| * @example isHarshad(2025) // true | ||
| */ | ||
| export const isHarshad = (val) => { | ||
| const num = Number(val) | ||
| if (num <= 0 || !Number.isInteger(num)) return false | ||
| let sum = 0, | ||
| temp = num | ||
| while (temp > 0) { | ||
| sum += temp % 10 | ||
| temp = Math.floor(temp / 10) | ||
| } | ||
| return num % sum === 0 | ||
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| import { isHarshad } from '../IsHarshad.js' | ||
| describe('Harshad number tests', () => { | ||
| test('Basic Harshad numbers', () => { | ||
| expect(isHarshad(18)).toBe(true) | ||
| expect(isHarshad(21)).toBe(true) | ||
| expect(isHarshad(12)).toBe(true) | ||
| expect(isHarshad(6804)).toBe(true) | ||
| expect(isHarshad('18')).toBe(true) | ||
| expect(isHarshad(2025)).toBe(true) | ||
| }) | ||
| test('Non-Harshad numbers', () => { | ||
| expect(isHarshad(19)).toBe(false) | ||
| expect(isHarshad(25)).toBe(false) | ||
| expect(isHarshad(97)).toBe(false) | ||
| }) | ||
| test('Edge cases', () => { | ||
| expect(isHarshad(0)).toBe(false) | ||
| expect(isHarshad(-18)).toBe(false) | ||
| expect(isHarshad(1)).toBe(true) | ||
| expect(isHarshad(10)).toBe(true) | ||
| }) | ||
| test('Input validation', () => { | ||
| expect(isHarshad(18.5)).toBe(false) | ||
| expect(isHarshad(null)).toBe(false) | ||
| expect(isHarshad(undefined)).toBe(false) | ||
| }) | ||
| }) |
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