Question

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Using jQuery to compare two arrays

I need a Javascript or jQuery function to determine if an array contains all the values of another array. The second array can have more values than the first.

This should return either true or false. For example.

comparing  array1 = [1,2,3]  and  array2 = [1,2]      should return false

comparing  array1 = [1,2,3]  and  array2 = [1,1,2]    should return false

comparing  array1 = [1,2,3]  and  array2 = [3,2,1]    should return true

comparing  array1 = [1,2,3]  and  array2 = [1,2,1,3]  should return true

Performance is not a concern. Thanks!

Answer 1

Checks each element in the first array and sees if it exists in the second array.

NB. This is pure javascript, might be an easier way in jQuery.

var notFound = false;

for(var i = 0, len = firstArray.length; i < len; i++){
    if(secondArray.indexOf(firstArray[i]) === -1)
    {
         notFound = true;
         break;
    }
}

if(notFound)
{
    ....
}