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added numberOfDigitsUsingLog method (#1364)

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* added numberOfDigitsUsingLog method

* added JSDoc comment

---------

Co-authored-by: madhuredra <madhuredra.tiwari@zemosolabs.com>
This commit is contained in:
Madhurendra Nath Tiwari
2023-09-22 13:49:13 +05:30
committed by GitHub
parent 268796b0e8
commit 6ad5b9c2b1
2 changed files with 21 additions and 2 deletions
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12
Maths/NumberOfDigits.js
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@ -9,4 +9,14 @@
const numberOfDigit = (n) => Math.abs(n).toString().length const numberOfDigit = (n) => Math.abs(n).toString().length
export { numberOfDigit } /**
* Returns the number of digits of a given integer.
*
* @param {number} n - The integer for which to count digits.
* @returns {number} The number of digits in the integer.
* @see https://math.stackexchange.com/questions/2145480/how-does-the-logarithm-returns-the-number-of-digits-of-a-number
* @author dev-madhurendra
*/
const numberOfDigitsUsingLog = (n) => n === 0 ? 1 : Math.floor(Math.log10(Math.abs(n))) + 1
export { numberOfDigit, numberOfDigitsUsingLog }

11
Maths/test/NumberOfDigits.test.js
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@ -1,4 +1,4 @@
import { numberOfDigit } from '../NumberOfDigits' import { numberOfDigit, numberOfDigitsUsingLog } from '../NumberOfDigits'
describe('NumberOfDigits', () => { describe('NumberOfDigits', () => {
it('should return the correct number of digits for an integer', () => { it('should return the correct number of digits for an integer', () => {
@ -8,4 +8,13 @@ describe('NumberOfDigits', () => {
it('should return the correct number of digits for a negative number', () => { it('should return the correct number of digits for a negative number', () => {
expect(numberOfDigit(-2346243)).toBe(7) expect(numberOfDigit(-2346243)).toBe(7)
}) })
it.each([
[0, 1],
[123423232, 9],
[-123423232, 9],
[9999, 4]
])('should return the correct number of digits in an integer', (value, expected) => {
expect(numberOfDigitsUsingLog(value)).toBe(expected)
})
}) })