Find closest date in array with JavaScript

by

You can easily use the sort function with a custom comparator function:

// assuming you have an array of Date objects - everything else is crap:
var arr = [new Date(2012, 7, 1), new Date(2012, 7, 4), new Date(2012, 7, 5), new Date(2013, 2, 20)];
var diffdate = new Date(2012, 7, 11);

arr.sort(function(a, b) {
    var distancea = Math.abs(diffdate - a);
    var distanceb = Math.abs(diffdate - b);
    return distancea - distanceb; // sort a before b when the distance is smaller
});

// result:
[2012-08-05, 2012-08-04, 2012-08-01, 2013-03-20]

To get only results before or after the diffdate, you can filter the array for that:

var beforedates = arr.filter(function(d) {
    return d - diffdate < 0;
}),
    afterdates = arr.filter(function(d) {
    return d - diffdate > 0;
});

If you have your custom array with the {the_date_object: new Date(...)} objects, you will need to adapt the sort algorithm with

    var distancea = Math.abs(diffdate - a.the_date_object);
    var distanceb = Math.abs(diffdate - b.the_date_object);

More Related Contents:

  1. In javascript, how do you search an array for a substring match
  2. Why Array.indexOf doesn’t find identical looking objects
  3. javascript search array of arrays
  4. Search array of objects for entry matching variable and check if it matches other fields
  5. How to search for a string inside an array of strings
  6. Get the item that appears the most times in an array
  7. How to find a value in an array of objects in JavaScript?
  8. JavaScript: Difference between .forEach() and .map()
  9. How to extend an existing JavaScript array with another array, without creating a new array
  10. Maximum size of an Array in Javascript
  11. Convert string with commas to array
  12. JavaScript, Node.js: is Array.forEach asynchronous?
  13. How to remove element from an array in JavaScript?
  14. How to flatten nested array in javascript? [duplicate]
  15. sort Javascript array by two numeric fields
  16. Merge duplicate objects in array of objects
  17. Create object from array
  18. Comparing two arrays of objects, and exclude the elements who match values into new array in JS
  19. How to generate range of numbers from 0 to n in ES2015 only?
  20. Does .sort function change original array?
  21. How to convert hex string into a bytes array, and a bytes array in the hex string?
  22. How do I group items in an array by date?
  23. Counting occurrences of particular property value in array of objects [duplicate]
  24. Filter nested array in object array by array of values
  25. Find last matching object in array of objects
  26. If I set only a high index in an array, does it waste memory?
  27. Using jQuery inArray with array of JavaScript Objects
  28. best way to generate empty 2D array
  29. Access object property in array of objects
  30. javaScript: Can a comma occur after the last set of values in an array?

Leave a Comment