In Swift, we can add an element to a hash by updating its key-value pair. Here's an example:
var namesAndAges = ["John": 28, "David": 25, "Sarah": 30]
To add a new element to this hash, we can simply set a new key-value pair:
namesAndAges["Olivia"] = 35
Now the hash will look like this:
["John": 28, "David": 25, "Sarah": 30, "Olivia": 35]
We can also use the updateValue(_:forKey:) method to add an element to the hash. Here's an example:
namesAndAges.updateValue(32, forKey: "Michael")
This will add a new key-value pair to the hash:
["John": 28, "David": 25, "Sarah": 30, "Olivia": 35, "Michael": 32]
Note that if the key already exists in the hash, the updateValue(_:forKey:) method will update its value instead of adding a new key-value pair.