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Binomial coefficient implementation#1094
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raklaptudirm merged 4 commits intoTheAlgorithms:masterfromitsAkshayDubey:binomial-coefficient-implementationSep 8, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /* | ||
| * Author: Akshay Dubey (https://github.com/itsAkshayDubey) | ||
| * Binomial Coefficient: https://en.wikipedia.org/wiki/Binomial_coefficient | ||
| * function to find binomial coefficient of numbers n and k. | ||
| * return binomial coefficient of n,k | ||
| */ | ||
| /** | ||
| * @function findBinomialCoefficient | ||
| * @description -> this function returns bonimial coefficient | ||
| * of two numbers n & k given by n!/((n-k)!k!) | ||
| * @param {number} n | ||
| * @param {number} k | ||
| * @returns {number} | ||
| */ | ||
| import { calcFactorial } from './Factorial' | ||
| export const findBinomialCoefficient = (n, k) => { | ||
| if ((typeof n !== 'number') || (typeof k !== 'number')) { | ||
| throw Error('Type of arguments must be number.') | ||
| } | ||
| if (n < 0 || k < 0) { | ||
| throw Error('Arguments must be greater than zero.') | ||
appgurueu marked this conversation as resolved. Show resolvedHide resolvedUh oh!There was an error while loading.Please reload this page. | ||
| } | ||
| let product = 1 | ||
| for (let i = n; i > k; i--) { | ||
| product *= i | ||
| } | ||
| return product / calcFactorial(n - k) | ||
| } | ||
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 +1,29 @@ | ||
| import { findBinomialCoefficient } from '../BinomialCoefficient.js' | ||
| describe('Testing findBinomialCoefficient function', () => { | ||
| it('should return 56', () => { | ||
| const binomialCoefficient = findBinomialCoefficient(8, 3) | ||
| expect(binomialCoefficient).toBe(56) | ||
| }) | ||
| it('should return 10', () => { | ||
| const binomialCoefficient = findBinomialCoefficient(5, 2) | ||
| expect(binomialCoefficient).toBe(10) | ||
| }) | ||
| it('should throw error when supplied arguments other than number', () => { | ||
| expect(() => { findBinomialCoefficient('eight', 'three') }).toThrow(Error) | ||
| }) | ||
| it('should throw error when n is less than zero', () => { | ||
| expect(() => { findBinomialCoefficient(-1, 3) }).toThrow(Error) | ||
| }) | ||
| it('should throw error when k is less than zero', () => { | ||
| expect(() => { findBinomialCoefficient(1, -3) }).toThrow(Error) | ||
| }) | ||
| it('should throw error when n and k are less than zero', () => { | ||
| expect(() => { findBinomialCoefficient(-1, -3) }).toThrow(Error) | ||
| }) | ||
| }) |
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