Build DoorDash Checkout Experience | Dataford Interview Questions

Can you build a complete checkout experience with product summary, payment options, and order confirmation using SwiftUI or UIKit within an hour?

For grading, implement the checkout behavior as a pure function that processes cart items, available payment options, and user actions. Return the final screen state, calculated total, selected payment method, confirmation status, and validation error.

The function signature and input/output shapes below model the UI behavior without requiring a platform framework.

Constraints

0 <= items.length <= 10^4
0 <= payment_options.length <= 10
0 <= actions.length <= 10^4
Each item has name, nonnegative integer price, and positive integer quantity
Payment identifiers are strings
Action types are select_payment or place_order

Function Signature

def checkout_flow(items, payment_options, actions):

Your question is Build DoorDash Checkout Experience. 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

Can you build a complete checkout experience with product summary, payment options, and order confirmation using SwiftUI or UIKit within an hour?

The function signature and input/output shapes below model the UI behavior without requiring a platform framework.

Constraints

0 <= items.length <= 10^4
0 <= payment_options.length <= 10
0 <= actions.length <= 10^4
Each item has name, nonnegative integer price, and positive integer quantity
Payment identifiers are strings
Action types are select_payment or place_order

Function Signature

def checkout_flow(items, payment_options, actions):

Your question is Build DoorDash Checkout Experience. 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.