Recreating a Dictionary

I have two versions for that challenge, one is intermediate to advanced (closer to intermediate, though), and the other is for beginners. I just want to specify: Beginner is not someone who just started learning and his knowledge ends when it comes to more than methods. I am talking about someone that has finished something like Brackeys’ course, maybe a LITTLE bit more. So Console.WriteLine people, you do better learn some more before trying this. 😉

INTERMEDIATE:
You have to recreate the dictionary, from the System.Collection.Generic namespace, which contains the following methods:
Add (an overload with a KeyValuePair and an overload with a key and a value)
Remove (overloads like the previous one)
Clear
Contains (one overload with a KeyValuePair, and one with a key)
MoveTo
CopyTo

You can rename all of those methods, of course, but make sure the meaning stays the same. I won’t give you any more information about that, you should know how to do it yourself. I will just give you one hint.
Hint: Use interfaces.
The test you should do is to make an instance, add some variables with the Add method, and then use a foreach loop to print them all. Be creative with the tests for the other methods. As an example, here is the test I did:


OverridenDictionary<int, string> thingsILike = new OverridenDictionary<int, string>();

thingsILike.Add(0, "I love food");

thingsILike.Add(1, "I kinda like sports");

thingsILike.Add(2, "I like programming");

thingsILike.Add(3, "I enjoy playing video games");
foreach(KeyValuePair<int, string> thingILike in thingsILike)

Console.WriteLine(thingILike);
Console.ReadLine();

I myself still didn’t make the other methods, but I already have the ideas of how to make them in my mind, so it shouldn’t be a problem.

BEGINNER:
Just like the intermediate, you should recreate the dictionary, but with less methods and you will get many more hints. Here are the methods:
Add (same overloads as the intermediate)
Remove (same as previously)
Clear

The people doing the intermediate might not wanna see those hints, so here they are, Beginners!:

Click to Expand	Show
Just like the intermediate, use interfaces. Here is the interface I would use: public interface IOverridenDictionary<TKey, TValue> { TValue this[TKey key] { get; } int Count { get; } ICollection<TKey> Keys { get; } ICollection<TValue> Values { get; } void Add(KeyValuePair<TKey, TValue> item); void Add(TKey key, TValue value); void Clear(); void Remove(KeyValuePair<TKey, TValue> item); void Remove(TKey key); You should already know about interfaces and generics, but just in case you don’t, Brackeys has tutorials about them. But what I don’t expect you to know, is indexers. I declared one at this line: TValue this[TKey key] { get; } Read about them here: https://msdn.microsoft.com/en-us/library/6x16t2tx.aspx You also need to know about IEnumerators, IEnumerable and the yield keyword. Here are videos/playlists about them: https://www.youtube.com/watch?v=L6R08ajgZpU&list=PL9B5E4C37F7B234A8 Use the same tests as the intermediate. This is all you should know to make a dictionary, have fun and good luck!

Click to Expand

Just like the intermediate, use interfaces. Here is the interface I would use:


public interface IOverridenDictionary<TKey, TValue>

{

TValue this[TKey key] { get; }
int Count { get; }
ICollection<TKey> Keys { get; }

ICollection<TValue> Values { get; }
void Add(KeyValuePair<TKey, TValue> item);

void Add(TKey key, TValue value);
void Clear();

void Remove(KeyValuePair<TKey, TValue> item);

void Remove(TKey key);

You should already know about interfaces and generics, but just in case you don’t, Brackeys has tutorials about them. But what I don’t expect you to know, is indexers. I declared one at this line:


TValue this[TKey key] { get; }

Read about them here: https://msdn.microsoft.com/en-us/library/6x16t2tx.aspx
You also need to know about IEnumerators, IEnumerable and the yield keyword. Here are videos/playlists about them:

https://www.youtube.com/watch?v=L6R08ajgZpU&list=PL9B5E4C37F7B234A8

Use the same tests as the intermediate.

This is all you should know to make a dictionary, have fun and good luck!

Let’s hope this isn’t gonna be like the previous challenge I made, and more people would enter. 😛 I actually feel like more people would joint this one… It’s better…
Well, good luck, if you will try. 😛

PEOPLE IN THIS DISCUSSION

Categories