Learn

What if we don’t need to loop through both the keys and the values of a dictionary? We can use the properties .keys and .values to create collections of the keys and values of a dictionary that we can then loop through.

The .keys property stores a collection of dictionary keys, while the .values property stores a collection of dictionary values.

For example:

var fruitStand = [ "Apples": 12, "Bananas": 20, "Oranges": 18 ] print(fruitStand.keys)

The print() statement in the above snippet will output the following keys:

["Bananas", "Oranges", "Apples"]

If we printed fruitStand.values, our output would include these values:

[20, 18, 12]

We can use these properties to specify how we want to iterate through a dictionary.

For example, if we only need the names of the fruits to create a list of what we sell, we can iterate through just the keys of fruitStand by appending .keys to the dictionary:

for fruit in fruitStand.keys { print(fruit) }

This would give us an output similar to this:

"Oranges" "Apples" "Bananas"

We could append .values to fruitStand to loop through the values of our dictionary and find out the total number of fruit we have in stock:

var total = 0 for fruitStock in fruitStand.values { total += fruitStock } print(total) // Prints: 50

Instructions

1.

Underneath the declaration of total, create a for-in loop that iterates only through the values of the dictionary lemonadeStand.

Name the placeholder monthlyProfit and leave the body of the for-in loop empty for now.

2.

In the body of the loop, increase the value of total by the value of monthlyProfit.

Take this course for free

Mini Info Outline Icon
By signing up for Codecademy, you agree to Codecademy's Terms of Service & Privacy Policy.

Or sign up using:

Already have an account?