Maps are also easy to add key-value pairs or to change the value of an existing pair. In both cases we specify the map name, the key, and the value:

yourMap[newKey] = newValue

So to add a new customer balance, we could do:

customers["Samantha"] =  1.25

We can use the same format to change an existing value. The format is the same! So when Samantha buys another donut:

customers["Samantha"] =  2.75

We now have the ability to add and update values in our maps. In the next exercise, we’ll learn how to remove key-value pairs. Before then let’s practice adding and updating!