Check if year is leap year in javascript

 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
      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


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

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