Write a JavaScript program to check leap year

Description: Check if a year is a leap year.

Hint:

• Divisible by 4 and not by 100, or divisible by 400.

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JavaScript program to check a leap year

function isLeap(year) {
  return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
}

for (const y of [2024, 1900, 2000, 2023]) {
  console.log(y + (isLeap(y) ? " is a leap year" : " is not a leap year"));
}

Output:

How it works

• 1900 is divisible by 100 but not by 400, so it is not a leap year.
• The ternary operator picks the text.

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