I am looking to sort the values in an array based on the current date.

My values :

[{
  date: "12-28",
  id: 1
}, {
  date: "11-30",
  id: 2
}, {
  date: "09-30",
  id: 3
}, {
  date: "05-30",
  id: 4
}]

I tried to do something like this, but it doesn't really work :

var array = [{id: 1, date:'12-28'}, 
{id: 2, date:'11-30'}, 
{id: 3, date:'09-30'}, 
{id: 4, date:'05-30'}];

const now = Date.now();

array.sort(function(a, b) {     
    var c = new Date(a.date);
    var d = new Date(b.date);
    return (now-c)-(now-d);
});

console.log(array);

If it's November 29th :

[{
  date: "11-30",
  id: 2
}, {
  date: "12-28",
  id: 1
}, {
  date: "05-30",
  id: 4
}, {
  date: "09-30",
  id: 3
}]

CodePudding user response：

You can use Array.sort() to give you the desired result, I've moved the dates in the input array to this year:

let input = [{ date: "2021-12-28", id: 1 }, { date: "2021-11-30", id: 2 }, { date: "2021-09-30", id: 3 }, { date: "2021-05-30", id: 4 }];

function sortByNearest({ date: a}, {date: b}) {
    const now = Date.now();
    return (Math.abs(Date.parse(a) - now)) - (Math.abs(Date.parse(b) - now));
}

console.log(input.sort(sortByNearest))
    

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CodePudding user response：

How about turning mm-dd to mmdd and then converting to number and then using Math.abs() as follows?

const arr = [
    {date: "12-28",id: 1}, 
    {date: "11-30",id: 2}, 
    {date: "09-30",id: 3}, 
    {date: "05-30",id: 4}
];

const dt = new Date();
const now =  [dt.getMonth() 1, dt.getDate()].map(v => `0${v}`.slice(-2)).join('');

const ordered = arr.sort((a,b) => Math.abs( a.date.replace(/[^\d] /,'') - now) - Math.abs( b.date.replace(/[^\d] /,'') - now));

console.log( ordered );

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