Most Frequently Purchased Item | Dataford Interview Questions

Write a function to find the most frequently purchased item from a list of transaction records.

Implement def most_frequent_item(transactions):, where transactions is a list of dictionaries containing an "item" string. Return the item with the highest purchase count, or None for an empty list. If multiple items are tied, return the one whose first transaction appears earliest.

Constraints

0 <= len(transactions) <= 10^4
Each transaction is a dictionary containing the string key "item"
Each item name is a non-empty string
If frequencies tie, return the item with the earliest first appearance

Function Signature

def most_frequent_item(transactions):

Your question is Most Frequently Purchased Item. Start with the requirements in the Question tab.

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Problem

Write a function to find the most frequently purchased item from a list of transaction records.

Constraints

0 <= len(transactions) <= 10^4
Each transaction is a dictionary containing the string key "item"
Each item name is a non-empty string
If frequencies tie, return the item with the earliest first appearance

Function Signature

def most_frequent_item(transactions):

Your question is Most Frequently Purchased Item. 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.