Lesson 4 - Dictionaries and sets in Kotlin
In the previous lesson, Multidimensional arrays in Kotlin, we took a little detour to multidimensional arrays. Today's Kotlin tutorial is about dictionaries and sets.
The idea of the dictionary is that we often need to access an element using a key. This concept works the same as with arrays where the keys (indexes) are numeric. The dictionary allows us to index using any data type, e.g. a string. We then access the elements of the collection using these strings. An analogy can be found in a real paper dictionary where we have each string word associated with the translation, explanation, other meanings, etc.
The data in this collection is stored in a special way known as hashing. This approach allows us to
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