Array Transform Like Pluck | Dataford Interview Questions

Disney+ Hotstar assembles content cards from arrays of metadata objects. Implement a pluck function that extracts the value at a specified property path from every record, preserving input order and leaving the original records unchanged.

The path may contain multiple property names separated by dots, such as "title" or "metadata.language". If any part of the path is missing, or an intermediate value is not an object, return None for that record.

Formal Specification

Input: records, a list of dictionaries, and path, a non-empty dot-separated string.
Output: A list containing one extracted value per input record. Values may be strings, numbers, booleans, dictionaries, lists, or None.
Property names are case-sensitive.
Do not mutate records or any nested dictionary.

Constraints

0 <= len(records) <= 10^5
Each record contains at most 50 properties
1 <= len(path) <= 100
Path segments are non-empty and contain no dots
The maximum path depth is 20

Function Signature

def pluck(records, path):

Your question is Array Transform Like Pluck. 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

Formal Specification

Input: records, a list of dictionaries, and path, a non-empty dot-separated string.
Output: A list containing one extracted value per input record. Values may be strings, numbers, booleans, dictionaries, lists, or None.
Property names are case-sensitive.
Do not mutate records or any nested dictionary.

Constraints

0 <= len(records) <= 10^5
Each record contains at most 50 properties
1 <= len(path) <= 100
Path segments are non-empty and contain no dots
The maximum path depth is 20

Function Signature

def pluck(records, path):

Your question is Array Transform Like Pluck. 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.