Same for undefined: age === undefinedIn both cases, you can check for:if (!age) { }and this will be matching both null and undefined.You can also use the typeof operator:let age typeof age //'undefined'although null is evaluated as an object, even though it is a primitive type:...
Calculating the Difference between Two Known Dates Unfortunately, calculating a date interval such as days, weeks, or months between two known dates is not as easy because you can’t just add Date objects together. In order to use a Date object in any sort of calculation, we must first ret...
Getting time difference between two times in javascript, I have tried to get the time difference between 2 different times and i am getting it correctly for hours and minutes. But if the second is greater than the first it will getting the problem. The time is displaying with negative data....