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#6879 closed enhancement (wontfix)

Opened August 05, 2010 10:54PM UTC

Closed October 27, 2010 06:03PM UTC

Add custom comparator to inArray

Reported by: kbwood Owned by:
Priority: undecided Milestone: 1.4.3
Component: misc Version: 1.4.2
Keywords: inArray Cc:
Blocked by: Blocking:

As an enhancement, add a third parameter to inArray that is a callback function for a custom equality comparison. This would allow for the matching of custom objects within an array without having to have a reference to the original object. For example, you could find a Date within an array like this:

var d1 = new Date(2010, 1-1, 1);

var d2 = new Date(2010, 2-1, 1);

var d3 = new Date(2010, 1-1, 1);

var dates = [d1, d2];

var index = $.inArray(d3, dates, function(a, b) {

return a.getTime() == b.getTime();


Maybe there could even be common comparators built-in, such as the date one above.

$ = function(a, b) {

return a.getTime() == b.getTime();


Attachments (0)
Change History (2)

Changed August 06, 2010 12:49AM UTC by dmethvin comment:1

Note that this enhancement would mean the quick path using a native Array.indexOf couldn't be taken.

Changed October 27, 2010 06:03PM UTC by SlexAxton comment:2

priority: → undecided
resolution: → wontfix
status: newclosed

inArray is an implementation of the ES5 spec, if I recall correctly. I think keeping it that way is important. It would be easy to add a plugin/wrapper in your app to do this though.