We use subscript syntax to operate on a dictionary. Let’s add a value to our dictionary:
</div> language-'></div>">Our dictionary now contains the key-value pair `"Green": 0`. We can use the same syntax to change the values within a dictionary:
<div class='oc-markdown-activatable oc-markdown-custom-container' data-value='```swift
scores["Red"] = 5
print(scores)
// prints: ["Red": 5, "Yellow": 7, "Blue": 1, "Green": 0]
'>
This updates the value of “Red” to 5. This does not add a new key-value pair to the dictionary because a value already exists for the key “Red” and keys in a dictionary are unique.
We also use subscript syntax to access values of the dictionary:
</div> language-'></div>">It’s possible that we try to access the value for a key that does not exist in the dictionary. In this case, dictionary access will return `nil`:
<div class='oc-markdown-activatable oc-markdown-custom-container' data-value='```swift
print(scores["Orange"])
// prints: nil
'>
Finally, we can remove a key-value pair from the dictionary by assigning nil to the key:
