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algorithm: add IntToBase algo and a test for it (#1258)
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Maths/IntToBase.js
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Maths/IntToBase.js
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/**
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* @function intToBase
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* @description Convert a number from decimal system to another (till decimal)
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* @param {Number} number Number to be converted
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* @param {Number} base Base of new number system
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* @returns {String} Converted Number
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* @see [HornerMethod](https://en.wikipedia.org/wiki/Horner%27s_method)
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* @example
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* const num1 = 125 // Needs to be converted to the binary number system
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* gornerScheme(num, 2); // ===> 1111101
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* @example
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* const num2 = 125 // Needs to be converted to the octal number system
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* gornerScheme(num, 8); // ===> 175
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*/
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const intToBase = (number, base) => {
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if (typeof number !== 'number' || typeof base !== 'number') {
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throw new Error('Input data must be numbers')
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}
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// Zero in any number system is zero
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if (number === 0) {
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return '0'
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}
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let absoluteValue = Math.abs(number)
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let convertedNumber = ''
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while (absoluteValue > 0) {
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// Every iteration last digit is taken away
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// and added to the previous one
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const lastDigit = absoluteValue % base
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convertedNumber = lastDigit + convertedNumber
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absoluteValue = Math.trunc(absoluteValue / base)
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}
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// Result is whether negative or positive,
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// depending on the original value
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if (number < 0) {
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convertedNumber = '-' + convertedNumber
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}
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return convertedNumber
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}
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export { intToBase }
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25
Maths/test/IntToBase.test.js
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Maths/test/IntToBase.test.js
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import { intToBase } from '../intToBase'
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describe('Int to Base', () => {
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test('Conversion to the binary system', () => {
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expect(intToBase(210, 2)).toEqual('11010010')
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expect(intToBase(-210, 2)).toEqual('-11010010')
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})
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test('Conversion to the system with base 5', () => {
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expect(intToBase(210, 5)).toEqual('1320')
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expect(intToBase(-210, 5)).toEqual('-1320')
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})
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test('Conversion to the octal system', () => {
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expect(intToBase(210, 8)).toEqual('322')
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expect(intToBase(-210, 8)).toEqual('-322')
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})
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test('Output is 0', () => {
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expect(intToBase(0, 8)).toEqual('0')
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expect(intToBase(0, 8)).toEqual('0')
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})
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test('Throwing an exception', () => {
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expect(() => intToBase('string', 2)).toThrow()
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expect(() => intToBase(10, 'base')).toThrow()
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expect(() => intToBase(true, false)).toThrow()
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})
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})
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