C#•8mo ago

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How do I return a dictionary

56 Replies

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);
Console.WriteLine();
Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public Dictionary getNameAndAge() // the error is here, how do i return a dictionary via a function?
    { //
        return nameAndAge; //
    } //



}

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);
Console.WriteLine();
Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public Dictionary getNameAndAge() // the error is here, how do i return a dictionary via a function?
    { //
        return nameAndAge; //
    } //



}

Hazel 🌊💃•8mo ago

Dictionary requires two type parameters. Dictionary<TKey, TValue>.

Muhammad•8mo ago

public Dictionary<string, int> getNameAndAge() { return nameAndAge; } like that? the key is a string and the value is an int

Hazel 🌊💃•8mo ago

🙂

Muhammad•8mo ago

but how do i get the whole list because i can only call it via the object not the class if i make it static? but i got this

System.Func`1[System.Collections.Generic.Dictionary`2[System.String,System.Int32]]

System.Func`1[System.Collections.Generic.Dictionary`2[System.String,System.Int32]]

Hazel 🌊💃•8mo ago

That looks like you tried something like this:

MODiX•8mo ago

Ahmed

REPL Result: Success

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);
Console.WriteLine(Human.getNameAndAge);
Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public static Dictionary<string, int> getNameAndAge()
    {
        return nameAndAge;
    }

}

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);
Console.WriteLine(Human.getNameAndAge);
Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public static Dictionary<string, int> getNameAndAge()
    {
        return nameAndAge;
    }

}

Console Output

Bob's age is 18 and he has connected.
Bobby's age is 16 and he has connected.
Bibby's age is 11 and he has connected.
3
System.Func`1[System.Collections.Generic.Dictionary`2[System.String,System.Int32]]

Bob's age is 18 and he has connected.
Bobby's age is 16 and he has connected.
Bibby's age is 11 and he has connected.
3
System.Func`1[System.Collections.Generic.Dictionary`2[System.String,System.Int32]]

Compile: 765.760ms | Execution: 122.947ms | React with ❌ to remove this embed.

Hazel 🌊💃•8mo ago

Console.WriteLine(bob.getNameAndAge)

Console.WriteLine(bob.getNameAndAge)

Muhammad•8mo ago

nope

Hazel 🌊💃•8mo ago

Console.WriteLine(Human.getNameAndAge);

Muhammad•8mo ago

Human.getNameAndAge yep

Hazel 🌊💃•8mo ago

That's practically exactly what you did. Human.getNameAndAge is a method, so you need to invoke it like one:

Human.getNameAndAge()

Human.getNameAndAge()

Muhammad•8mo ago

Console.WriteLine(Human.getNameAndAge());

Console.WriteLine(Human.getNameAndAge());

? i tried same thing

MODiX•8mo ago

Ahmed

REPL Result: Success

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);
Console.WriteLine(Human.getNameAndAge());
Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public static Dictionary<string, int> getNameAndAge()
    {
        return nameAndAge;
    }

}

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);
Console.WriteLine(Human.getNameAndAge());
Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public static Dictionary<string, int> getNameAndAge()
    {
        return nameAndAge;
    }

}

Console Output

Bob's age is 18 and he has connected.
Bobby's age is 16 and he has connected.
Bibby's age is 11 and he has connected.
3
System.Collections.Generic.Dictionary`2[System.String,System.Int32]

Bob's age is 18 and he has connected.
Bobby's age is 16 and he has connected.
Bibby's age is 11 and he has connected.
3
System.Collections.Generic.Dictionary`2[System.String,System.Int32]

Compile: 770.151ms | Execution: 121.414ms | React with ❌ to remove this embed.

Hazel 🌊💃•8mo ago

It's not the same thing It's different

Muhammad•8mo ago

oh ye i see

Hazel 🌊💃•8mo ago

Look closely:

System.Func`1[System.Collections.Generic.Dictionary`2[System.String,System.Int32]]
System.Collections.Generic.Dictionary`2[System.String,System.Int32]

System.Func`1[System.Collections.Generic.Dictionary`2[System.String,System.Int32]]
System.Collections.Generic.Dictionary`2[System.String,System.Int32]

Muhammad•8mo ago

i saw

Hazel 🌊💃•8mo ago

You're getting closer

Muhammad•8mo ago

yeah

Hazel 🌊💃•8mo ago

So, I imagine what you want is to print all names and ages

Muhammad•8mo ago

ye in dictionary form {key, value, ... }

Hazel 🌊💃•8mo ago

You need to iterate over the elements and print each one like:

Console.WriteLine($"{item.Key}: {item.Value}");

Console.WriteLine($"{item.Key}: {item.Value}");

Muhammad•8mo ago

hmm i'd need to iterate a certain number of times too so i got a question dict = {key, value [0] key,value [1] } does the first pair count as 0

Hazel 🌊💃•8mo ago

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/statements/iteration-statements

Iteration statements -for, foreach, do, and while - C#

C# iteration statements (for, foreach, do, and while) repeatedly execute a block of code. You use those statements to create loops or iterate through a collection.

Hazel 🌊💃•8mo ago

C# is a zero-based language, yes. Your snippet doesn't make much sense though.

Muhammad•8mo ago

look

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);


int length_of_objectCount = Human.objectCount;
for (int iterator = 0; iterator > length_of_objectCount; iterator++)
{
    Console.WriteLine(Human.nameAndAge);
}


Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public static Dictionary<string, int> getNameAndAge()
    {
        return nameAndAge;
    }

}

Human bob = new Human("Bob", 18);
Human bobby = new Human("Bobby", 16);
Human bibby = new Human("Bibby", 11);

Console.WriteLine(Human.objectCount);


int length_of_objectCount = Human.objectCount;
for (int iterator = 0; iterator > length_of_objectCount; iterator++)
{
    Console.WriteLine(Human.nameAndAge);
}


Console.ReadLine();

class Human
{
    private string name { get; set; }
    private int age { get; set; }
    public static int objectCount;

    static Dictionary<string, int> nameAndAge = new Dictionary<string, int>();

    public Human(string name, int age)
    {

        this.name = name;
        this.age = age;
        objectCount++;

        Console.WriteLine($"{this.name}'s age is {this.age} and he has connected.");

        nameAndAge.Add(name, age);

    }

    public static Dictionary<string, int> getNameAndAge()
    {
        return nameAndAge;
    }

}

this is the snippet im referring to

int length_of_objectCount = Human.objectCount;
for (int iterator = 0; iterator > length_of_objectCount; iterator++)
{
    Console.WriteLine(Human.nameAndAge);
}

int length_of_objectCount = Human.objectCount;
for (int iterator = 0; iterator > length_of_objectCount; iterator++)
{
    Console.WriteLine(Human.nameAndAge);
}

@The Dark Realm's No. 2 - Hazel

Muhammad•8mo ago

Hazel 🌊💃•8mo ago

Try using foreach instead. for will work, but foreach is really all that's needed here.

Muhammad•8mo ago

it's working with the for how would you do it?

Hazel 🌊💃•8mo ago

I'll tell you once you have a working version in the thread 🙂 Giving you what I would do won't help you learn 😄

Angius•8mo ago

The dictionary has string as the key, you can't use numbers from 0 up to get items from it this way

Muhammad•8mo ago

it's for the index of the pair key = 0, value = 1 and it's iterating over the pairs

Hazel 🌊💃•8mo ago

It's not though When you access the dictionary like that it expects the key, not an index.

Muhammad•8mo ago

not yet

Hazel 🌊💃•8mo ago

I highly recommend trying to use foreach instead.

MODiX•8mo ago

Angius

REPL Result: Success

var dictr = new Dictionary<string, int>(){
    ["twelve"] = 12,
    ["eleven"] = 11,
};

dictr["twelve"]

var dictr = new Dictionary<string, int>(){
    ["twelve"] = 12,
    ["eleven"] = 11,
};

dictr["twelve"]

Result: int

Compile: 515.941ms | Execution: 40.232ms | React with ❌ to remove this embed.

Angius•8mo ago

This is how you retrieve values from a dictionary But, yes, if you wanted both keys and values, you would use a foreach

Hazel 🌊💃•8mo ago

You can technically iterate over the keys using an index IIRC

Muhammad•8mo ago

ima leave this code here n switch to foreach

int length_of_objectCount = Human.objectCount;
Dictionary<string, int> list_for_nameAndAge = Human.nameAndAge;
for (int iterator = 0; iterator > length_of_objectCount; iterator++)
{
    string key = list_for_nameAndAge[KeyValuePair];
    int value = 
}

int length_of_objectCount = Human.objectCount;
Dictionary<string, int> list_for_nameAndAge = Human.nameAndAge;
for (int iterator = 0; iterator > length_of_objectCount; iterator++)
{
    string key = list_for_nameAndAge[KeyValuePair];
    int value = 
}

Hazel 🌊💃•8mo ago

Best way to learn 🙂

Muhammad•8mo ago

how do i use foreach what arguments does it take

MODiX•8mo ago

Angius

REPL Result: Success

foreach (char letter in "word")
{
    Console.WriteLine($"The letter is '{letter}'");
}

foreach (char letter in "word")
{
    Console.WriteLine($"The letter is '{letter}'");
}

Console Output

The letter is 'w'
The letter is 'o'
The letter is 'r'
The letter is 'd'

The letter is 'w'
The letter is 'o'
The letter is 'r'
The letter is 'd'

Compile: 612.394ms | Execution: 91.784ms | React with ❌ to remove this embed.

Muhammad•8mo ago

int length_of_objectCount = Human.objectCount;
Dictionary<string, int> list_for_nameAndAge = Human.nameAndAge;
foreach (var pair in list_for_nameAndAge)
{
    Console.WriteLine(pair.Key, pair.Value);
}

int length_of_objectCount = Human.objectCount;
Dictionary<string, int> list_for_nameAndAge = Human.nameAndAge;
foreach (var pair in list_for_nameAndAge)
{
    Console.WriteLine(pair.Key, pair.Value);
}

Angius•8mo ago

$tias

MODiX•8mo ago

https://images-ext-1.discordapp.net/external/CO2vsU2aXbRqYy1RdewOYnkBq1nGFBjdbjlNgjvG67A/https/media.discordapp.net/attachments/364492811489509376/964064233035816990/unknown.png?width=543&height=257

Muhammad•8mo ago

it's only showing the key

Angius•8mo ago

Trial and error, the basis of all science, including computer science lol

Muhammad•8mo ago

not the value int length_of_objectCount = Human.objectCount; Dictionary<string, int> list_for_nameAndAge = Human.nameAndAge; foreach (var pair in list_for_nameAndAge) { Console.WriteLine(pair.Key + pair.Value); } i fixed it how do you get it to appear like {key, value ... } in that format

Angius•8mo ago

$"{{{pair.Key}, {pair.Value}}}" should do the trick

Muhammad•8mo ago

you gotta do it by hand? 💀

Angius•8mo ago

Well, you could serialize the dictionary to JSON and print it all if you wanted to Otherwise, yes

Muhammad•8mo ago

nvm ye thank you okay i got the hang of it thank you :)))

Hazel 🌊💃•8mo ago

I supplied a link to documentation that goes over it.

Muhammad•8mo ago

@The Dark Realm's No. 2 - Hazel u 2 thank you 🙂 i understand now thank you again !close

Accord•8mo ago

Closed! Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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