dfoverdx

/**
 * @document Permutations.ts
 *
 * I wanted to figure out, just for the challenge of it, whether I could, given an array type `A`, produce a type that
 * matches any array with every element of `A` exactly once in any order.  I *love* abusing the TS typing engine.  It
 * insulted my mother once.
 */

/** 
 * Returns an array type that includes every element of `T` exactly once in any order.

dfoverdx

It took a few years, but I finally understand why member functions of classes in JavaScript aren't automatically bound to their objects, in particular when used in callback arguments.

In most object-oriented languages, functions are members of a class--they exist in memory only once, and when they are called, this is simply a hidden argument of the function which is assigned to the object that's calling it. Python makes this explicit by requiring that the first argument of a class's member function be self (Python's equivalent of this--you can name self whatever you want, but self is the convention).

class MyClass:

dfoverdx

import Client from 'some-database-api';
import { connectionInfo } from './config';

class AsyncDatabaseClient {
    constructor() {
        this._connection = null;
        this._initialized = Client.connect(connectionInfo).then(c => this.connection = c);

        return new Proxy(this, {
            get(target, prop, receiver) {