guhou

export function sequence<T>(
  map: Map<string, Promise<T>>
): Promise<Map<string, T>> {
  return Promise.all(
    Array.from(map, ([key, promisedValue]) =>
      promisedValue.then<[string, T]>(value => [key, value])
    )
  ).then((entries) => new Map(entries));
}

guhou

### Keybase proof

I hereby claim:

  * I am guhou on github.
  * I am guhou (https://keybase.io/guhou) on keybase.
  * I have a public key ASAZNEe0DRKu9xFDlHFgr6TGZPyE9zmMdBt86gMWZixpUQo

To claim this, I am signing this object:

guhou

An introduction to generic Lists in C#

In this article I present an introduction to generic List types in the C# language. I assume an audience familiar with the principles of structured programming, including parameters, arrays and procedures, but with little experience with object-oriented programming. I will motivate an example for an encapsulated collection class, and then introduce generics as a means to improve our collection.

guhou

using System;
using System.Collections.Generic;

public class Cache<K, V> where V : class
{
    private readonly Dictionary<K, WeakReference<V>> _data;

    public Cache()
    {
        _data = new Dictionary<K, WeakReference<V>>();