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86d333ee94
* chore: Switch to Node 20 + Vitest * chore: migrate to vitest mock functions * chore: code style (switch to prettier) * test: re-enable long-running test Seems the switch to Node 20 and Vitest has vastly improved the code's and / or the test's runtime! see #1193 * chore: code style * chore: fix failing tests * Updated Documentation in README.md * Update contribution guidelines to state usage of Prettier * fix: set prettier printWidth back to 80 * chore: apply updated code style automatically * fix: set prettier line endings to lf again * chore: apply updated code style automatically --------- Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> Co-authored-by: Lars Müller <34514239+appgurueu@users.noreply.github.com>
19 lines
757 B
JavaScript
19 lines
757 B
JavaScript
/**
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* isLeapYear :: Number -> Boolean
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*
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* Check if a year is a leap year or not. A leap year is a year which has 366 days.
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* For the extra +1 day the February month contains 29 days instead of 28 days.
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*
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* The logic behind the leap year is-
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* 1. If the year is divisible by 400 then it is a leap year.
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* 2. If it is not divisible by 400 but divisible by 100 then it is not a leap year.
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* 3. If the year is not divisible by both 400 and 100 but divisible by 4 then a leap year.
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* 4. Other cases except the describing ones are not a leap year.
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*
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* @param {number} year
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* @returns {boolean} true if this is a leap year, false otherwise.
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*/
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export const isLeapYear = (year) => {
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return year % 400 === 0 || (year % 100 !== 0 && year % 4 === 0)
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}
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