Data object extension leap year javascript [duplicate]

Question

This is my code so far:

/*function isSchrikkeljaar(year) {
    year = 2016;
    if (//is empty(year)) {
       //use current year
    }
    if (year%4===0 && (year%100!=0 || year%400===0)) {
       return true;
       console.log(true);
    } else {
       return false;
        console.log(false);
    }
}*/

If the year is a leap year it logs true, if not it should log false, if the year is empty it should take the current year. Can anyone help me out, been stuck for a while. The problem is that I don't know how to give it the current year when the year is empty.

Remove the year=2016. do year=year||2016 , this will take 2016 if isSchrikkeljaar — Jonas Wilms
– Jonas Wilms, Commented Jan 11, 2017 at 14:50
If the logs are not showing, move the log statement above return otherwise those will not execute. — Tushar
– Tushar, Commented Jan 11, 2017 at 14:52
Also a duplicate of Set a default parameter value for a JavaScript function ... please use the search before you ask a new question. — Felix Kling
– Felix Kling, Commented Jan 11, 2017 at 14:56
var isLeapYear = (year = new Date().getFullYear()) => year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0); — Tushar
– Tushar, Commented Jan 11, 2017 at 14:58

Jonas Wilms · Accepted Answer · 2017-01-11 14:53:37Z

1

 function isSchrikkeljaar(year) { 
    year = year||new Date().getFullYear();
    if (year%4===0 && (year%100!=0 || year%400===0)) { 
       return true; 
    } else { 
       return false;
    } 
 }

If year is set take year as year, if not take the actual date and get its year.

Use cases:

isSchrikkelyear();//2017 = false
isSchrikkelyear(2016); //false

edited Jan 11, 2017 at 14:53

answered Jan 11, 2017 at 14:52

Jonas Wilms

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