dictionary Archives - Page 3 of 20

C#, Programming

IT Nursery

Recreating a Dictionary from an IEnumerable

I have a method that returns an IEnumerable<KeyValuePair<string, ArrayList>>, but some of the callers require the result of the method to be a ...

May 30, 2022
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Programming, Python

IT Nursery

How can I use if/else in a dictionary comprehension?

Does there exist a way in Python 2.7+ to make something like the following? { something_if_true if condition else something_if_false for key, value in ...

May 30, 2022
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Programming, Python

IT Nursery

How to save a dictionary to a file?

I have problem with changing a dict value and saving the dict to a text file (the format must be same), I only ...

May 30, 2022
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Programming, Python

IT Nursery

How to implement an ordered, default dict?

I would like to combine OrderedDict() and defaultdict() from collections in one object, which shall be an ordered, default dict. Is this possible? ...

May 30, 2022
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C++, Programming

IT Nursery

In STL maps, is it better to use map::insert than []?

A while ago, I had a discussion with a colleague about how to insert values in STL maps. I preferred map[key] = value; ...

May 30, 2022
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Programming, Python

IT Nursery

How to create key or append an element to key?

I have an empty dictionary. Name: dict_x It is to have keys of which values are lists. From a separate iteration, I obtain ...

May 30, 2022
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linq, Programming

IT Nursery

LINQ Group By into a Dictionary Object

I am trying to use LINQ to create a Dictionary<string, List<CustomObject>> from a List<CustomObject>. I can get this to work using “var”, but ...

May 29, 2022
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C++, Programming

IT Nursery

Why is std::map implemented as a red-black tree?

Why is std::map implemented as a red-black tree? There are several balanced binary search trees (BSTs) out there. What were design trade-offs in ...

May 28, 2022
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Programming, Python

IT Nursery

What’s a correct and good way to implement hash()?

What’s a correct and good way to implement __hash__()? I am talking about the function that returns a hashcode that is then used ...

May 28, 2022
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C#, Programming

IT Nursery

Literal notation for Dictionary in C#?

I currently have a WebSocket between JavaScript and a server programmed in C#. In JavaScript, I can pass data easily using an associative ...

May 28, 2022
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