Closure-Based Counter Factory | Dataford Interview Questions

Implement a function make_counter(start) that returns a closure. The returned function accepts one integer argument delta, adds delta to an internal counter initialized to start, and returns the updated counter value. The internal state must remain private and persist across multiple calls to the returned function.

Constraints

-10^9 <= start <= 10^9
0 <= len(calls) <= 10^5
-10^9 <= calls[i] <= 10^9
The returned function must preserve state across repeated invocations

Function Signature

def run_counter(start, calls):

Your question is Closure-Based Counter Factory. 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

Constraints

-10^9 <= start <= 10^9
0 <= len(calls) <= 10^5
-10^9 <= calls[i] <= 10^9
The returned function must preserve state across repeated invocations

Function Signature

def run_counter(start, calls):

Your question is Closure-Based Counter Factory. 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.