Getting the sum of random values in the dictionary

Question

Hello all!

Coding C# question here!

I have inventory with 4 different objects: Lemon, Apple, Coffee, Mango

each object has different score: 20, 40, 60, 80 (respectively).

I want to use dictionary to assign the values. Dictionary<string, float> scoreDictionary = new Dictionary<string, float>()

Now whenever I see only apple, Lemon and Mango (or other combination), I want the method to sum their values

So my plane is to add each value to dictionary and then be able to sum the values based on the Key I get.

      if ((rows[0].stoppedSlot != rows[1].stoppedSlot) && (rows[1].stoppedSlot != rows[2].stoppedSlot))
     {
         for (int i = 0; i < prizeDictionary.Count; i++)
         {
             // here summarize the three values I get
         }
     }

So basically, in other script I assign a string and add it's name + value to a dictionary,

and in the other script I want to say, "take the strings that you get" and sum the values based on the string name.

Answer 1

Answer by tehpro_unity · Dec 31, 2018 at 01:22 AM

@Eco-Editor

 float sum = prizeDictionary["Apple"] + prizeDictionary["Lemon"] + prizeDictionary["Mango"];

Hope I understood you correctly what you want to do.

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Answer 2

Use Linq.

   class DemoClass
   {
     private Dictionary<string, float> prizeDictionary = new Dictionary<string, float>() {
       { "lemon", 20},
       { "apple", 40},
       { "coffee", 60},
       { "mango", 80},
     };
 
     public float GetSum(params string[] nKeys)
     {
       return prizeDictionary.Where(x => nKeys.Contains(x.Key)).Sum(y => y.Value);
     }
 
     public float GetSumWithDuplicates(params string[] nKeys)
     {
       return nKeys.Select(x => prizeDictionary.ContainsKey(x) ? prizeDictionary[x] : 0).Sum();
     }
   }

Test Project:

   class Program
   {
     static void Main(string[] args)
     {
       DemoClass demo = new DemoClass();
       Console.WriteLine("Score 1: " + demo.GetSum("apple", "coffee"));
 
       List<string> keys = new List<string>
       {
         "lemon",
         "mango",
         "mango",
         "mango",
         "not a key",
         "car"
       };
       
       Console.WriteLine("Score 2: " + demo.GetSumWithDuplicates(keys.ToArray()));
 
       Console.ReadLine();
     }
   }

Output:

Score 1: 100

Score 2: 260

Getting the sum of random values in the dictionary

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