closestTo value is show in terminal but could not be utilized in the program

[emadbaqeri]

Hey folks, I'm trying to find the closest date based on today. I have used closestTo utility function. While I'm trying to log the output value of this function everything works fine and I see the output but since I'm using it in the program I get undefined out of it. Any Ideas would be appreciated :)

import * as dateFns from 'date-fns';

const today = new Date().getTime();
const dates = [
  2022-04-10T14:07:12.276Z,
  2022-04-10T14:07:06.967Z,
  2022-04-10T14:07:04.663Z,
  2022-04-10T14:07:03.040Z,
  2022-04-10T14:07:01.420Z,
  2022-04-10T14:06:59.869Z,
  2022-04-10T14:06:53.223Z
]

const closestIndex = dateFns.closestTo(today, dates);

console.log(closestIndex); // => 0

console.log(dates[closestIndex]); // => undefined could not be used as index value

[fturmel]

Hi @emadbaqeri,

Please refer to the docs to see the proper function usage.

1. closestTo returns a date, while closestIndexTo returns an index.
2. The array passed need to be of JS Date instances or timestamps (ECMAScript epoch), not strings.
3. If the value of the returned index is undefined, it's likely because the array of dates passed to the function was empty.

https://date-fns.org/docs/closestTo
https://date-fns.org/docs/closestIndexTo

import { closestIndexTo } from "date-fns";

const today = new Date();
const dates = [
  new Date("2022-04-10T14:07:12.276Z"),
  new Date("2022-04-10T14:07:06.967Z"),
  new Date("2022-04-10T14:07:04.663Z"),
  new Date("2022-04-10T14:07:03.040Z"),
  new Date("2022-04-10T14:07:01.420Z"),
  new Date("2022-04-10T14:06:59.869Z"),
  new Date("2022-04-10T14:06:53.223Z")
];

const closestIndex = closestIndexTo(today, dates);

console.log(closestIndex); // 0
console.log(dates[closestIndex].toISOString()); // 2022-04-10T14:07:12.276Z

console.log(closestIndexTo(today, [])); // undefined

[emadbaqeri]

Thanks @fturmel, the issue has been resolved.
By the way thanks for time ;)