korniychuk’s gists

korniychuk / collection.ts

Created July 25, 2016 09:38

TypeScript: extends Array class example

	'use strict';
	class Collection<T> extends Array<T> {
	// noinspection JSAnnotator
	public constructor(...args: T[]) {
	let array = super(...args);

	Object.setPrototypeOf(array, this.constructor.prototype);

	return array;
	}

korniychuk / encrypt-example.js

Last active October 8, 2016 04:17

Simple encryption algorithm

	class Security {
	static encrypt(text, password) {
	password = String(password);

	return String(text)
	.split('')
	.map((char, index) => String.fromCharCode(char.charCodeAt(0) + password.charCodeAt(index % password.length)))
	.join('');
	}

korniychuk / di.ts

Created November 11, 2016 20:24

Dependency container example :: typescript

	declare type Dependency = any;
	declare type DependencyKey = string\|number\|{new(...args: any[])};

	/**
	* Dependency injection container
	*
	* Example:
	*
	* // There is a class
	* class Auth { ... }

korniychuk / encoder.ts

Last active January 17, 2017 01:39

Very simple encoder that supports UTF-16 characters

	class Encoder {
	public static encode(str: string, pass: string): string {
	let res = '';
	let j = 0, jlen = pass.length;
	str = pass + str;

	for (let i = 0, ilen = str.length; i < ilen; i++) {
	let charCode = str.charCodeAt(i),
	passCode = pass.charCodeAt(j),
	sumCode = charCode + passCode;

korniychuk / Str2Hex.js

Created January 23, 2017 10:57

Encode any string to hex codes and decode back

	let str = 'My Secure String';

	let enc = str.split('').map(char => '0x'+char.codePointAt(0).toString(16)).join(' ');
	let dec = enc.split(' ').map(code => String.fromCodePoint(parseInt(code))).join('')

	console.log(`Encoded: '${enc}'`);
	console.log(`'${str}' === '${dec}'`, str === dec);

korniychuk / rhombus.js

Created February 13, 2017 05:15

Drowing a rhombus using the symbol '*' in a single line

	function rhombus(n) {
	return n < 0 \|\| n % 2 == 0 ? null :
	[
	(n - (n % 2)) / 2,
	max => Array(max+1).fill(1).map((i, j) => ' '.repeat(max-j) + ''.repeat(j2+1)),
	half => half.concat(half.slice(0, -1).reverse(), '').join('\n')
	]
	.reduce((curr, fn) => fn(curr));
	}
	}

korniychuk / learn-html__1__lists.html

Last active June 13, 2017 15:38

korniychuk / to.ts

Created July 10, 2017 14:26

types converter

	/**
	* This is helper class for parse server response
	*/
	export class To {

	public static number(raw: any): number {
	const n = Number(raw);
	return raw === undefined \|\| raw === null \|\| isNaN(n) ? null : n;
	}

korniychuk / bash-mysql_has-database.sh

Created September 2, 2017 14:53

check if mysql database exists

	hasDatabase() {
	DB_NAME=$1;
	return $(MYSQL_PWD="${MYSQL_ROOT_PASSWORD}" mysql -u${DB_USER} --skip-column-names --batch -e "SHOW DATABASES LIKE '${DB_NAME}'" \| wc -l)
	}

korniychuk / encoder-to-char-codes.html

Last active September 16, 2017 19:56

	<!doctype html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>Encoder</title>
	<script>
	var numberSystem = +prompt('Введите систему счисления(число от 2 до 36):', '16');

	if (numberSystem >= 2 && numberSystem <= 36) {
	var data = prompt('Введите данные для обработки:');

Anton Korniychuk korniychuk