@samyt it's possible with standard JS to "flatten" the two arrays if you bung them in to a single array. so you'd have new_array = [arr,arr1] then flatten new_array. Then you can reduce to remove duplicates.

I dnt want merge two arrays . I need to check for the unique value only in second array from both array

Ok so you mean you want to compare arr and arr1 and return only those in arr1 that are not in arr?