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Check Leap Year

Certification: Basic Level Accuracy: 0% Submissions: 0 Points: 8

Write a JavaScript program to determine if a given year is a leap year. A leap year is a year that is evenly divisible by 4, except for century years (years ending in 00) which must be divisible by 400 to be a leap year.

Example 1
    
  
  • Input: year = 2024
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  • Output: true
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  • Explanation: 
    2024 is divisible by 4 (2024 ÷ 4 = 506). 2024 is not a century year (doesn't end in 00). Since it's divisible by 4 and not a century year, 2024 is a leap year.
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Example 2
    
  
  • Input: year = 1900
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  • Output: false
    • 
  
  • Explanation: 1900 is a century year (ends in 00). For century years, it must be divisible by 400 to be a leap year. 1900 ÷ 400 = 4.75, so it's not divisible by 400. Therefore, 1900 is not a leap year.
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Constraints
    
  
  • 1 ≤ year ≤ 3000
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  • The input will always be a positive integer
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  • Consider both regular years and century years
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  • Time Complexity: O(1)
    • 
  
  • Space Complexity: O(1)
    •
NumberControl StructuresPwCArctwist
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Hint
Solution

Solution Hints

    
  
  • Check if the year is divisible by 400 first - if yes, it's a leap year
    • 
  
  • If not divisible by 400, check if it's divisible by 100 - if yes, it's not a leap year
    • 
  
  • If not divisible by 100, check if it's divisible by 4 - if yes, it's a leap year
    • 
  
  • Use the modulo operator (%) to check divisibility
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  • The order of conditions matters: check 400 first, then 100, then 4
    •

Steps to solve by this approach:

 Step 1: First check if the year is divisible by 400 using the modulo operator.
 Step 2: If divisible by 400, return true immediately as it's definitely a leap year.
 Step 3: If not divisible by 400, check if the year is divisible by 100.
 Step 4: If divisible by 100 (but not 400), return false as century years need to be divisible by 400.
 Step 5: If not divisible by 100, check if the year is divisible by 4.
 Step 6: If divisible by 4, return true as non-century years divisible by 4 are leap years.
 Step 7: If none of the above conditions are met, return false as it's not a leap year.

Submitted Code :