I've got an array with multiple objects in it with the following information:

string ProductDescription/Name

int Amount

I want to create an new array that combines the Amount of the same productdescriptions. Example: the 1st array contains: Product X 50, Product X 80 and Product X 140.

My new array should be Product X 270.
Now I found something about checking if a value is already in an array: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/some

But I want something that will check the ProductDescription, instead of the object.

So I took the same function:

function checkAvailability(arr, val) 

{

    return arr.some(function(arrVal) 

    {

        return val === arrVal;

    });

}

And I try it like this:

var found = checkAvailability(arrayProduct['Productomschrijving'], javascript_array[i]['Productomschrijving']);

But it gives an error...

Uncaught TypeError: Cannot read property 'some' of undefined

When I do it like this:

var found = checkAvailability(arrayProduct, javascript_array[i]['Productomschrijving']);

It's always false. Kinda normal since it's comparing a string with objects.

So how can I get this solved that my some function is checking on the property of an object instead of the complete object?