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
}]
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${v}`.slice(-2)).join('');
const ordered = arr.sort((a,b) => Math.abs(+a.date.replace(/[^\d]+/,'') - now) - Math.abs(+b.date.replace(/[^\d]+/,'') - now));
console.log( ordered );All Dates Future
If all dates are to be considered to be present or future, here is a concept we can employ:
const arr = [
{date: "12-28",id: 1},
{date: "11-30",id: 2},
{date: "09-30",id: 3},
{date: "05-30",id: 4}
];
//converts m-d to mm-dd
const fmt = md => md.split('-').map(p => `0${p}`.slice(-2)).join('-');
const now = new Date();
const year = new Date().getFullYear();
const nww = fmt(`${now.getMonth()+1}-${now.getDate()}`);
const nw = new Date(`${year}-${nww}`).getTime();
const ordered = arr.map(({
date: d,
id
}) => ({
date: d,
id,
d: `${d < nww ? (year + 1) : year}-${d}`
})).map(({
d,
...rest
}) => ({
...rest,
d,
...{
t: new Date(d).getTime()
}
})).sort((a, b) => (a.t - nw) - (b.t - nw)).map(({
date,
id
}) => ({
date,
id
}));
console.log( ordered );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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