An interesting line of JavaScript code

This article will introduce you to some interesting code in JavaScript , which is very short, usually one line long, and can help us solve some problems very efficiently.

Time operation

Check if the date is valid

This method is used to check if the given date is valid:

const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());
isDateValid("December 17, 1995 03:24:00");  // true

Calculate the interval between two dates

This method is used to calculate the interval between two dates:

const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)
    
dayDif(new Date("2021-11-3"), new Date("2022-2-1"))  // 90

Find the date on the day of the year

The method used to detect the date given is on the day of the year:

const dayOfYear = (date) => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);

dayOfYear(new Date());   // 307

String operation

String First letter uppercase