10.3 Data and Maps

New Material

In this module you will learn about features of databases, then, continuing the tutorial on the wiki, use Node.js with MongoDB database to let users store information to display on a map.

Data Persistence

Excerpt 10.3.1

Data persistence describes the practice of storing and using data beyond the life of a program or a web page. You encounter this every day when you save text to a file on your computer’s hard drive and view it again later, or an app remembers you have logged in because it saved a token inside a cookie, or when you post text or images on the internet for others to see.

A diagram showing the relationship between client, server, and database for Big Feelings.

10.3 Data and Maps

async function main() {
    let data = await fetchFeelings();
    console.log(data);
    await updateMap(data);
}

function updateMap(data) {
    removeMarkers();
    for (let i = 0; i < data.length; i++) {
        console.log(data[i]);
        markerLayer[i] = createMarker(data[i]);
    }
}