Dmitry Escaroda escaroda

Chrome Extensions for Learning Japanese

Some useful Chrome extensions that I use to learn Japanese.

A guide to George Polya's "How to Solve It"

Introduction

George Polya (1887-1985) was a Hungarian mathematician and educator who revolutionized our understanding of problem-solving and teaching. While he made significant contributions to mathematics, his most enduring legacy is his insights into how people learn and solve problems. His 1945 book "How to Solve It" has influenced educators across numerous fields, extending far beyond mathematics.

Polya's Teaching Philosophy

Polya's approach centered on three key principles. First, he championed active learning, believing students learn best by discovering solutions themselves rather than being told answers. Second, he emphasized heuristic thinking - the art of guided discovery and learning from experience, viewing problem-solving as a skill that can be developed through practice. Third, he developed sophisticated questionin

Generic 1,2,3 Noise

float rand(float n){return fract(sin(n) * 43758.5453123);}

float noise(float p){
	float fl = floor(p);
  float fc = fract(p);
	return mix(rand(fl), rand(fl + 1.0), fc);
}

How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SLL rating)

Virtual hosts

Let's say you want to host domains first.com and second.com.

Create folders for their files:

	var UInt4 = function (value) {
	return (value & 0xF);
	};

	var Int4 = function (value) {
	var ref = UInt4(value);
	return (ref > 0x7) ? ref - 0x10 : ref;
	};

	var UInt8 = function (value) {

	import {
	AfterViewInit,
	Component,
	ElementRef,
	Input,
	OnDestroy,
	ViewChild
	} from '@angular/core';
	import { fromEvent } from 'rxjs';
	import { pairwise, switchMap, takeUntil } from 'rxjs/operators';

	<!--
	This is a quick ui that wraps yurixi's code from https://habr.com/post/359244/
	It can save PNG and SVG.
	All credit goes to him for doing pretty much all the work here.
	-->
	<!DOCTYPE html>
	<html lang="en">
	<html>

	<head>

	( 3\|0 ) === 3; // целые числа не изменяет
	( 3.3\|0 ) === 3; // у дробных чисел отбрасывает дробную часть
	( 3.8\|0 ) === 3; // не округляет, а именно отбрасывает дробную часть
	( -3.3\|0 ) === -3; // в том числе и у отрицательных дробных чисел
	( -3.8\|0 ) === -3; // у которых Math.floor(-3.3) == Math.floor(-3.8) == -4
	( "3"\|0 ) === 3; // строки с числами преобразуются к целым числам
	( "3.8"\|0 ) === 3; // при этом опять же отбрасывается дробная часть
	( "-3.8"\|0 ) === -3; // в том числе и у отрицательных дробных чисел
	( NaN\|0 ) === 0; // NaN приводится к нулю
	( Infinity\|0 ) === 0; // приведение к нулю происходит и с бесконечностью,

	const getSpecifiedDay = {
	oncePerMonth: (fromDate, dayOfWeek, numberOfTimes, startHours, endHours) => {

	// Get first day of the month by given fromDate
	const currentMonth = moment(fromDate).startOf('month');

	// Get desired dayOfWeek of currentMonth's first week
	const firstDayInMonth = currentMonth.clone().weekday(dayOfWeek);

	// Check if firstDayInMonth is in the given month

	// bad
	async function someAsyncFunc() {
	const user = await asyncGetUser();
	const categories = await asyncGetCategories();
	const mapping = await asyncMapUserWithCategory(user, categories);
	}

	// good
	async function someAsyncFunc() {
	const [user, categories] = await Promise.all([