When building interactive maps in React, you often need to display data that can change over time, such as locations fetched from an API or updated by user actions. To visualize this dynamic data, you typically store your data points in React state or receive them as props. You can then use JavaScript's array methods to render each data point as a separate marker on your map. The most common approach is to use the map function to loop through your array of data points, returning a marker component for each item.

For example, suppose you have an array of location objects, each with a latitude, longitude, and a label. You would map over this array and render a marker for each location, passing the necessary coordinates as props to each marker component. This approach ensures that your map always reflects the current state of your data, and any updates to the array will automatically update the map's markers.

Keeping your map elements in sync with your data is crucial for a responsive user experience. Whenever your data changes—whether due to user interaction, new data being fetched, or other updates—React's rendering process will efficiently update the markers. Best practices for handling these updates include:

• Using unique keys for each marker when mapping over your data points;
• Keeping your data in the closest common ancestor component that needs to access or update it;
• Avoiding direct mutation of your data arrays, instead using state update functions to trigger re-renders;
• Minimizing unnecessary re-renders by memoizing components or using React's built-in optimization hooks when appropriate.

By following these practices, you ensure that your map remains up-to-date and efficient, with markers accurately representing the current data set at all times.