Check if year is leap year in javascript [duplicate]

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

Answer 1

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

Answer 2

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 => new Date(year, 1, 29).getDate() === 29; 

Result

isLeap(1004) // true isLeap(1001) // false