Build a Stateful Calculator

Q: Build a Stateful Calculator

This question evaluates a candidate's ability to model and manage UI state, handle event-driven input, and implement correct operator chaining in a calculator component, testing frontend state management and user interface behavior within the software engineering fundamentals domain.

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Question

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Implement a calculator UI component.

Requirements:

Support digit input and the operators + , - , * , and / .
Support = to finalize the current calculation.
Support a reset action that clears the calculator state.
The display must update correctly during chained operations, not only at the very end.

Example behavior:

Input: 1 , + , 100 , + , 20 , =
When the second + is pressed, the display should immediately show 101 .
After = is pressed, the display should show 121 .

Explain how you would model the calculator state and implement operator chaining so the UI always shows the correct current value.

Build a Stateful Calculator

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Solution

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