Accessing values of dictionary not by Key

Question

Imagine we have a dictionary<string , int> and we want to manipulate values of this dictionary.
As far as i know, we can access value only by its key. But i think it is inefficient because we must add a couple of line to do that.
Is there another solution. For example in array we can access elements and modify them by index. Is there a similar solution to change values in dictionary?
Thank you a lot guy.

Answer 1

The solution can be i.e.:

foreach (var a in coffee.Keys.ToArray()){
coffee[a]-=discount;
Console.WriteLine(coffee[a]);
}

Answer 2

What do you see here inefficient:

foreach (string s in d.Keys)
Console.WriteLine(s + ": " + d[s]);

Otherwise you can use generic collections depending of needed application.

Answer 3

Thank you a lot JaScript .
The best for you.

Answer 4

What do you mean with
var a?
Please link your attempt first here then can be seen to help you.

Answer 5

https://code.sololearn.com/cEo3BQKUFuVs/?ref=app
Note:i dont want directly use keys of dictionary.

Answer 6

foreach (var a in coffee.Keys){
coffee[a]-=discount;
}
coffee is a dictionary. The above code results in exception. discount and values of coffee are integer type.
JaScript : you mention using generic collection . How can i do the same job using collection?

Answer 7

Mohammad Reza Morawej You are welcome.