Closures and Practical Use

MediumPython

Problem

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: def 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):

CodePython 3

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