How to compare 2 arrays and check if any item is the same in jQuery/Javascript

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So I have these two arrays and I am trying to throw an alert if both arrays have any of the same element in them, any body have any experience with this?

C#

var selectedFacils = [];
var selectedExcludeFacils = [];
$("#selectFacilParams_chosen").find(".search-choice").each(function () {
    var elem = jQuery(this).text();
    selectedFacils.push(elem);
});
$("#selectFacilParamsExclude_chosen").find(".search-choice").each(function () {
    var elem = jQuery(this).text();
    selectedExcludeFacils.push(elem);
});

Posted 4-Mar-14 4:00am

JasonMacD

Updated 23-Jul-20 0:45am

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Sergey Alexandrovich Kryukov 4-Mar-14 10:28am

Any on the same position, or compare all with all?
—SA

JasonMacD 4-Mar-14 10:33am

Positioning doesn't matter, just if there are any matches at all anywhere.

3 solutions

Solution 2

If positions do not matter and the array lengths are same, I would recommend you sort the two arrays and then compare the array values one by one.

If the array lengths are unequal, you can work on the principles of the merge sort algorithm, and get a list of items that are common across both arrays.

Posted 4-Mar-14 5:06am

Abhinav S

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Sergey Alexandrovich Kryukov 4-Mar-14 11:21am

Makes sense, could optimize it, a 5.
—SA

Abhinav S 4-Mar-14 11:27am

Thank you SA.

JasonMacD 4-Mar-14 11:30am

The array lengths most likely would not be the same, these are param inputs (included/excluded). If an input is included it cannot be excluded and vice versa. Any code examples on this?

Abhinav S 4-Mar-14 11:40am

https://vikasrao.wordpress.com/tag/compare-2-arrays-javascript/

Solution 3

Posted 23-Jul-20 0:45am

Member 14896981

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CHill60 23-Jul-20 7:00am

Essentially a rehash of solution 1 from 6 years ago

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Sergey Alexandrovich Kryukov · Accepted Answer · 2014-03-04T04:40:00

Thank you for the clarification. It means that you need to perform N * M comparisons, where N and M are lengths of the two arrays. Do it in two nested loops.

This is simple is your array keys are consecutive integers and you know the sizes. In Javascript, any array is an associative container with any keys. If this is the concern, you can use Object.keys and iterate by keys. Please see:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys[^].

For better alternative, analyze how you end up having two different arrays with duplicate objects and think at preventing this situation in first place, when you add objects to the array.

—SA

How to compare 2 arrays and check if any item is the same in jQuery/Javascript

3 solutions

Solution 1

Solution 2

Solution 3

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