How to find the number of days in a month?

Question

JavaScript

I am writing a calendar, I need to create arrays (12 months) in an array using a loop, and I can’t understand how I should write a condition so that each array (month) writes as many elements (days) as it has (in each month same number of days).

Answer 1

//январь'19
(new Date(2019, 1, 0)).getDate() // 31

//февраль'19
(new Date(2019, 2, 0)).getDate() // 28

//февраль'16 високосный
(new Date(2016, 2, 0)).getDate() // 29