Map Interview Questions

Use map() to transform arrays into JSX elements. Know when to use filter() and flatMap(), and how to handle nested arrays and empty states.

Objects cannot be mapped directly in JSX. Use Object.entries(), Object.keys(), or Object.values() to convert to arrays first, then map to JSX.

Render a controlled select dropdown from an array of strings or objects using map(). Know how to track the selected value and handle the placeholder option.

Render a controlled radio group from an array using map(). Understand the name attribute for grouping, checked from state, and accessibility with fieldset and legend.