Closures and Practical Use | Dataford Interview Questions

Describe the concept of closures and provide a practical use case.

Implement run_counter(initial, operations), where each operation is a dictionary with type "add" and an integer value, or type "read". Return the running total after every operation. Use a nested closure to encapsulate the total and update it with nonlocal.

Signature: run_counter(initial, operations) Input is an integer and a list of operation dictionaries. Output is a list of integers.

Constraints

-10^9 <= initial <= 10^9
0 <= operations.length <= 10^4
Each operation has type "add" or "read"
Each "add" operation contains an integer value between -10^9 and 10^9

Function Signature

def run_counter(initial, operations):

Your question is Closures and Practical Use. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Describe the concept of closures and provide a practical use case.

Signature: run_counter(initial, operations) Input is an integer and a list of operation dictionaries. Output is a list of integers.

Constraints

-10^9 <= initial <= 10^9
0 <= operations.length <= 10^4
Each operation has type "add" or "read"
Each "add" operation contains an integer value between -10^9 and 10^9

Function Signature

def run_counter(initial, operations):

Your question is Closures and Practical Use. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.