We now have everything we need to store a value in the hash table array. The only thing left is to assign the value at the index we calculated with the index(for:) function.
Storing and printing a value in a hash table should look something similar to:
To assign a value to an array using the above subscript format, we will first create an update(value:for:) method that will handle the logic needed to take a key-value pair from the subscript() function and store the value at a particular index.
Secondly, we will overload the subscript() function to assign a key-value pair.
Instructions
Create a private mutating method, update(value:for:) that takes in two String parameters. The first parameter is named value and the second is key for accessing the key. The second parameter has an argument label for.
Inside your new function, create a constant elementIndex assigned to calling your index(for:) function on the key parameter.
Set the value at the specified index to be value.
Next, overload the public method subscript that takes in a String parameter called key. Since subscript will be a getter and setter for array values, have this method return an optional String.
Inside your new subscript(key:) function, declare a setter and a getter. Inside the getter, return the empty String for now. This will get changed in a future exercise.
Inside the setter, use an if let statement to ensure that the value is valid and not nil. If there is a valid value, call the update(value:for:) function on the value and the key.