Alexander Kubarskii kubarskii

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Open to relocation. Google, hire me!)

7 followers · 19 following

EPAM Systems
Russia, Saint-Petersburg/Turkey, Antalya

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kubarskii / test-lib.js

Last active March 24, 2021 22:03

A try to create some kind of small testing lib that compares expected result and actual (made in educational purposes). Currently tests works properly only with sync functions.

	function testExecutor(value) {
	const A = function (x) {
	this.value = x;
	this.success = false;
	};

	A.prototype.toBe = function (x) {
	if (JSON.stringify(x) === JSON.stringify(this.value) && typeof this.value === typeof x) {
	this.success = true;
	console.log(`%cPassed: ${JSON.stringify(x)} equals ${JSON.stringify(this.value)}`, 'color: green;');

kubarskii / gist:64463c97b73180249b2f0b0fcdee0d39

Created May 11, 2021 18:58

Memo function

	const memo = (function () {
	const cache = new Map()
	return function (fn, ctx = null, ...params) {
	if (cache.has([fn, params, ctx].toString())) {
	return cache.get([fn, params, ctx].toString())
	} else {
	const res = fn.call(ctx, ...params);
	cache.set([fn, params, ctx].toString(), res);
	return res;
	}

kubarskii / trampoline.js

Created May 13, 2021 22:05

Trampoline example

	function sum(n, s = 0) {
	return (n) ? () => sum(n - 1, s + n) : s
	}

	function trampoline(fn) {
	return function (...args) {
	let res = fn.apply(null, args)
	while (typeof res === 'function') {
	res = res()
	}

kubarskii / redux-architecture.js

Last active February 12, 2024 20:34

redux architecture implementation example

	class Observer {
	#initialValue;
	#subscriptions = [];

	constructor(initialValue) {
	this.#initialValue = initialValue;
	}

	subscribe(fn) {
	this.#subscriptions.push(fn);

kubarskii / opaque.ts

Created November 10, 2021 14:50

Opaque type using typescript

	declare namespace Tag {
	const OpaqueTagSymbol: unique symbol;
	class OpaqueTag<S extends symbol> {
	private [OpaqueTagSymbol]: S;
	}
	export type OpaqueType<T, S extends symbol> = T & OpaqueTag<S>;
	}

	export declare type Opaque<T, S extends symbol> = Tag.OpaqueType<T, S>;

kubarskii / ErrorBoundary.tsx

Created November 26, 2021 13:41

	import React, {PureComponent} from 'react'

	class Boundary extends PureComponent<any, any> {
	static getDerivedStateFromError(error: any) {
	return {hasError: true, error: error.toString()}
	}

	state = {
	hasError: false,
	error: '',

kubarskii / video.html

Last active September 29, 2023 00:41

Render video as ascii

	<!doctype html>
	<html>
	<head>
	<meta charset="UTF-8">
	<meta name="viewport"
	content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>Document</title>
	</head>