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Revert "Revert "Add LeapYear.js"" #31

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Aug 31, 2022
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Revert "Revert "Add LeapYear.js"" #31

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22 changes: 22 additions & 0 deletions Maths/LeapYear.js
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/**
* isLeapYear :: Number -> Boolean
*
* Check if a year is a leap year or not. A leap year is a year which has 366 days.
* For the extra +1 day the February month contains 29 days instead of 28 days.
*
* The logic behind the leap year is-
* 1. If the year is divisible by 400 then it is a leap year.
* 2. If it is not divisible by 400 but divisible by 100 then it is not a leap year.
* 3. If the year is not divisible by both 400 and 100 but divisible by 4 then a leap year.
* 4. Other cases except the describing ones are not a leap year.
*
* @param {number} year
* @returns {boolean} true if this is a leap year, false otherwise.
*/
export const isLeapYear = (year) => {
if (year % 400 === 0) return true
if (year % 100 === 0) return false
if (year % 4 === 0) return true

return false
}
22 changes: 22 additions & 0 deletions Maths/test/LeapYear.test.js
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import { isLeapYear } from '../LeapYear'

describe('Leap Year', () => {
it('Should return true on the year 2000', () => {
expect(isLeapYear(2000)).toBe(true)
})
it('Should return false on the year 2001', () => {
expect(isLeapYear(2001)).toBe(false)
})
it('Should return false on the year 2002', () => {
expect(isLeapYear(2002)).toBe(false)
})
it('Should return false on the year 2003', () => {
expect(isLeapYear(2003)).toBe(false)
})
it('Should return false on the year 2004', () => {
expect(isLeapYear(2004)).toBe(true)
})
it('Should return false on the year 1900', () => {
expect(isLeapYear(1900)).toBe(false)
})
})