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feat: add pronic number algorithm #1981

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feat: add pronic number algorithm #1981

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21 changes: 21 additions & 0 deletions Maths/PronicNumber.js
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/**
* @function isPronicNumber
* @description A pronic number (also known as an oblong number) is a
* number that is the product of two consecutive integers.
* Examples: 0, 2, 6, 12, 20, 30, 42...
* @param {number} n - A non-negative integer
* @returns {boolean} - True if n is a pronic number, false otherwise
* @see https://en.wikipedia.org/wiki/Pronic_number
* @example isPronicNumber(6) => true
* @example isPronicNumber(12) => true
* @example isPronicNumber(10) => false
*/
const isPronicNumber = (n) => {
if (!Number.isInteger(n) || n < 0) {
throw new TypeError('Input must be a non-negative integer')
}
const sqrt = Math.floor(Math.sqrt(n))
return sqrt * (sqrt + 1) === n
}

export { isPronicNumber }
51 changes: 51 additions & 0 deletions Maths/test/PronicNumber.test.js
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import { isPronicNumber } from '../PronicNumber.js'

describe('isPronicNumber', () => {
test('0 is a pronic number (0 x 1)', () => {
expect(isPronicNumber(0)).toBe(true)
})

test('2 is a pronic number (1 x 2)', () => {
expect(isPronicNumber(2)).toBe(true)
})

test('6 is a pronic number (2 x 3)', () => {
expect(isPronicNumber(6)).toBe(true)
})

test('12 is a pronic number (3 x 4)', () => {
expect(isPronicNumber(12)).toBe(true)
})

test('20 is a pronic number (4 x 5)', () => {
expect(isPronicNumber(20)).toBe(true)
})

test('30 is a pronic number (5 x 6)', () => {
expect(isPronicNumber(30)).toBe(true)
})

test('42 is a pronic number (6 x 7)', () => {
expect(isPronicNumber(42)).toBe(true)
})

test('1 is NOT a pronic number', () => {
expect(isPronicNumber(1)).toBe(false)
})

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

test('15 is NOT a pronic number', () => {
expect(isPronicNumber(15)).toBe(false)
})

test('throws TypeError for negative input', () => {
expect(() => isPronicNumber(-1)).toThrow(TypeError)
})

test('throws TypeError for float input', () => {
expect(() => isPronicNumber(6.5)).toThrow(TypeError)
})
})
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