Implement a Chat Feature | Dataford Interview Questions

Implement a chat feature in an existing application.

For this coding exercise, convert a flat list of messages into conversation state for the active user. Return each conversation's messages in chronological order and conversations ordered by their latest message.

Use build_chat_state(messages, current_user_id), where each message contains id, conversation_id, sender_id, text, timestamp, and is_read; return dictionaries containing conversation_id, messages, and unread_count.

Constraints

0 <= messages.length <= 1000
Each message contains all required fields
Message IDs are unique
Conversation IDs and user IDs are strings
Timestamps are integers
Messages within a conversation are ordered by timestamp, then message ID
The active user's own messages never contribute to unread_count

Function Signature

def build_chat_state(messages, current_user_id):

Your question is Implement a Chat Feature. Start with the requirements in the Question tab.

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Problem

Implement a chat feature in an existing application.

Constraints

0 <= messages.length <= 1000
Each message contains all required fields
Message IDs are unique
Conversation IDs and user IDs are strings
Timestamps are integers
Messages within a conversation are ordered by timestamp, then message ID
The active user's own messages never contribute to unread_count

Function Signature

def build_chat_state(messages, current_user_id):

Your question is Implement a Chat Feature. 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.