How to compare the content of two arrays in jQuery?

Question

I have two arrays and I want to compare the content of array1 with array2.

var array1 = ['test1','test2','test3','test4'];
var array2 = ['test2','test3'];

And only if array1 matches array2 (like test2 == test2) then it should do something. So in this case it should iterate over the two arrays, but only do something for test2 and test3.

Thank you for your answers!

Possible duplicate of [How to compare arrays in JavaScript?](https://stackoverflow.com/questions/7837456/how-to-compare-arrays-in-javascript) — Prasanna Venkatesh, Aug 17 '17 at 12:44
Your questions is not clear. Do you want to compare 2 arrays see if their contents are the same? Are you searching if an element of array1 exists in array2? if yes; Are the index locations relevant? — Ulug Toprak, Aug 17 '17 at 12:57

score 1 · Answer 1 · answered Aug 17 '17 at 13:27

You can use $.grep followed by $.inArray():

var array1 = ['test1', 'test2', 'test3', 'test4'];
var array2 = ['test2', 'test3', 'test5'];
var unique = $.grep(array2, function(element) {
  if ($.inArray(element, array1) !== -1) {
    console.log(element)
    // do something here...
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

score 0 · Answer 2 · answered Aug 17 '17 at 13:35

$(document).ready(function () {

            var array1 = ['test1', 'test2', 'test3', 'test4'];
            var array2 = ['test2', 'test3'];

            for (var i = 0; i < array1.length; i++) {

                if($.inArray(array1[i], array2) > -1)
                {
                    alert(array1[i]);
                }
            }


        });

How to compare the content of two arrays in jQuery?

2 Answers2