Challenge Task 2 of 2

Hello, Kyle Vandeven and Fernando Benavides

Yes, there're different ways of approaching the problem, but for this particular code challenge.

Assign the value for key "UK" to a constant named ukCurrency.

You should be using dictionary key lookup to retrieve the value from currencies dictionary.

let ukCurrency = currencies["UK"]

There're several disadvantages of hard coding the value "pound" to the ukCurrency constant VS using dictionary key-lookup.

• it defeats the purpose of using a dictionary data structure.
• for this code, the currencies dictionary is small, containing merely 3 entries, if however it has hundreds of thousands entries stored in an unordered fashion, it'd take you quite a while to scan through the collection to find the value associated with a particular key.
• if some point in the future, UK decides to join the EU, and changes its currency to Euro, you'd have to change your code in both lines, whereas in using the key-lookup, we only need to change the code in one place.

Hope this helps.