Check if year is leap year in javascript

Question

function leapYear year       var result       year   parseInt document getElementById  isYear   value       if  years 400         result   true           else if years 100         result   false           else if years 4         result  true           else        result  false           return result      This is what I have so far  the entry is on a from thus stored in  isYear    I basically followed this here  so using what I already have  how can I check if the entry is a leap year based on these conditions note I may have done it wrong when implementing the pseudocode  please correct me if I have   Edit  Note this needs to use an integer not a date function

User · Answer

If you re doing this in an Node js app  you can use the leap-year package   npm install --save leap-year   Then from your app  use the following code to verify whether the provided year or date object is a leap year   var leapYear   require  leap-year     leapYear 2014       gt  false   leapYear 2016       gt  true    Using a library like this has the advantage that you don t have to deal with the dirty details of getting all of the special cases right  since the library takes care of that

User · Answer

You can try using JavaScript s Date Object  new Date year month  getFullYear   4  0   This will return true or false

User · Answer

You can use the following code to check if it s a leap year   ily   function yr        return  yr   400      yr   100      yr   4    false   true    false    true

User · Answer

My Code Is Very Easy To Understand  var year   2015  var LeapYear   year   4   if  LeapYear  0        alert  This is Leap Year      else       alert  This is not leap year

User · Answer

function leapYear year      return   year   4    0   amp  amp   year   100    0       year   400    0

User · Answer

A faster solution is provided by Kevin P  Rice here https   stackoverflow com a 11595914 5535820 So here s the code   function leapYear year        return  year  amp  3     0  amp  amp    year   25     0     year  amp  15     0

User · Answer

The function checks if February has 29 days  If it does  then we have a leap year  ES5 function isLeap year      return new Date year  1  29  getDate       29     ES6 const isLeap   year   gt  new Date year  1  29  getDate       29   Result isLeap 1004     true isLeap 1001     false

[javascript] Check if year is leap year in javascript

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