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View 10.js
const nearestAsteroidsByAngle = pipe(
mapValues(ps => ps.sort((p1, p2) => distToLaser(p1) - distToLaser(p2))),
cycle([...nearestAsteroidsByAngle.keys()].sort((a, b) => a - b)),
skipWhile(a => a < -Math.PI/2),
View ParamsURL.js
export class ParamsURL extends URL {
constructor(href, params, origin = globalThis.location) {
super(href, origin);
if (params) { = new URLSearchParams([...this.searchParams, ...Object.entries(params)]);
View urlWithParams.js
export const urlWithParams = (url, params) => {
const u = new URL(url, global.location.origin)
if (params) { = new URLSearchParams([...u.searchParams, ...Object.entries(params)])
return u.href
qwtel / JSONRequest.js
Last active Oct 27, 2019
Subtypes of the browser's own Request and Response types adopted for JSON objects.
View JSONRequest.js
export class JSONRequest extends Request {
constructor(input, init, replacer, space) {
const { headers: h, body: b, } = init || {};
const body = b ? JSON.stringify(b, replacer, space) : null;
const headers = new Headers(h);
headers.set('Accept', 'application/json, text/plain, */*');
if (body) headers.set('Content-Type', 'application/json;charset=UTF-8');
qwtel /
Last active Sep 8, 2019
Returns the first promise that resolves with a truthy value, or undefined if all promises resolve with a nullish value.

Returns the first promise that resolves with a truthy value, or undefined if all promises resolve with a nullish value.

Note that this inherits the behavior of Promise.race, where the returned promise rejects as soon as one input promise rejects.

Example use case: Getting a cached response from a number of caches, without resorting to a lookup in all caches via caches.match:

View replacing-cryptojs-with-web-cryptography-for-aes.js
import md5 from "js-md5";
import { base64ToUint8Array, splitUint8Array, concatUint8Arrays } from "./utils";
const HEAD_SIZE_DWORD = 2;
const SALT_SIZE_DWORD = 2;
export async function decryptCryptoJSCipherBase64(

Keybase proof

I hereby claim:

  • I am qwtel on github.
  • I am qwtel ( on keybase.
  • I have a public key ASCbFur24236CAj1oGXKHjjTVGaT35JcTLQNXvXUFG7aOwo

To claim this, I am signing this object:

View fetch-rx.js
function fetchRx(url, options) {
const controller = new AbortController();
const { signal } = controller;
return Observable.create(observer => {
fetch(url, { signal, ...options })
.then(x =>
.catch(x => observer.error(x))
.finally(() => observer.complete())
return () => controller.abort();
View sigV4Client.js
* Copyright (c) 2018 Florian Klampfer <>
* This software uses portions of `sigV4Client.js`,
* which is Apache-2.0 licensed with the following copyright:
* > Copyright 2010-2016, Inc. or its affiliates. All Rights Reserved.
* Changes:
* * Replaced "crypto-js" with Web Cryptography API
qwtel / jsx-create-element.js
Last active Dec 6, 2017
Patches the default document.createElement function to follow the JSX/React.createElement function signature.
View jsx-create-element.js
var createElement = document.createElement.bind(document);
function appendChild(child) {
child instanceof Element ? child : document.createTextNode(child)
document.createElement = function(tagName, attrs, children) {
var el = createElement(tagName);
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