JavaScript Problem: Determining the Earliest or Latest Date

The last few tutorials I seem to be on a Date object kick. In this tutorial we are going to look at how you can take an array of dates and pick the earliest or latest.

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[shabnamnaaz]

We need great teachers like you, please please take care of yourself.

[alanmartin]

You're the best. Wishing your family good health and recovery.

[polliluiz]

Amazing Steven. The best teacher ever.

[magnusfohlstrom]

//Math min and max is an fast way to solve it, as it was said valueof can be used or getTime.

//So there are two functions that can help. The first one is the sort helper function,
//that will mine milliseconds, in order to sort the array...

function byTime(r = false){
return (a, b) => {
[a, b] = [a.getTime(), b.valueOf()];
return a < b ? r ? 1 : -1 : a > b ? r ? -1 : 1 : 0;
};
}
//Here we use valueof or getTime or both....

//Then we shall have an extractor...
function getFirstLast(array){
let {[0] : first, [array.length - 1] : last} = [...array];
return {'earliest':first, 'latest':last, 'all':array};
}
//That here will return a object, with what we need and more if so needed...

//Example of use... This array have different way to create a Date object with Date Function..
let seriesOfDates = [
new Date(), //This moment
new Date(2026, 2, 7), //Date Attributes
new Date(2015, 5, 25, 14, 25), // With hours and minutes
new Date(60*60*24*1000 * (-365 * 2) + //millisecond
new Date("Mars 05 2077 06:32:57.545"), //String
new Date(2012, 6) //First day of month
];

//Let put it together..
let results =

//Output...
console.log(results.earliest, results.latest);

[tanzeemahmed]

Your tutorials are easy to understand. Can you please make tutorials on how to read javascript api document? I get confused reading document as methods are overloaded with multiple implementations. Thanks

[عبدالقادرعبدالرحمنعبدالله]

Very helpful content.
Thank you so much for sharing.

[relaxingwithoutinterruptio]

Hi Steven, can you tell us what do you think about Vue js, It will be great to hear your opinion, anyway amazing tutorial as always, thanks

[kashmirtechtv]

I'm not getting able to apply correct condition like I'm getting incorrect results... I have msfe the dates in format with moment