Compose and State Retention | Dataford Interview Questions

Implement a Compose function that draws objects on screen and retains them across orientation change (remember, rememberSaveable, custom Saver).

Asked in the Round 2: Coding Android stage. For grading, model the state layer as a pure function: use saved_state when available, otherwise use the current objects, and return the ordered objects that should be rendered.

Contract

objects and saved_state are lists of drawable dictionaries with id, type, x, y, and color. Return a new list without mutating either input. A custom Saver must preserve every field.

Constraints

0 <= len(objects), len(saved_state) <= 1000
Each object contains exactly the fields id, type, x, y, and color
Object IDs are unique within each input list
The function must not mutate either input

Function Signature

def compose_canvas(objects, saved_state):

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