.net - Compare two ArrayLists -
i trying compare 2 arraylist s without success. what have this: dim array_1 new arraylist() dim array_2 new arraylist() dim final_array new arraylist() in array_1 , array_2 have: array_1({10, 20}, {11, 25}, {12, 10}) array_2({10, 10}, {11, 20}) and in final_array want get: array_1(1) - array_2(1) to this: final_array({10, 10}, {11, 5}, {12, 10} how can create code correctly? here attempt: for each element in array_1 each element_2 in array_2 if element(0) = element_2(0) final_array.add({element(0), element(1) - element_2(1)}) else final_array.add({element(0), element(1)}) end if next next this code not want. you should not join 2 arrays that. basically, each element in first array, iterate whole second array. so, in pseudo-code (sorry, vb skills awful) should this: let end = min(array1.lenght, array2.length) = 0 end if array1[i].first = array2[i].first final_array[i] = {array1[i].firs...