QBurst Technologies Senior Engineer Interview Questions, Process, and Tips

Yes, it is possible to work with multiple threads in core data.

• Use NSManagedObjectContextConcurrencyType to specify concurrency type

• Create a separate managed object context for each thread

• Use performBlock or performBlockAndWait to execute tasks on the correct context

• Merge changes from other contexts using NSManagedObjectContextDidSaveNotification

Memory leaks occur when a program fails to release memory that is no longer needed.

• Memory leaks can happen due to programming errors such as not freeing allocated memory

• Leaked memory can accumulate over time and cause the program to crash or slow down

• Memory leaks can be detected using tools such as valgrind or by analyzing the program's behavior

• Examples of memory leaks include forgetting to free memory allocated for a ...read more

The optimal algorithm for finding common elements in two arrays is using a hash table.

• Create a hash table for one of the arrays.

• Iterate through the other array and check if each element exists in the hash table.

• If it does, add it to the result array.

• Time complexity is O(n) and space complexity is O(n).