Choi Gyumin (Alvin Choi) choegyumin

Indie Hacker & Frontend Engineer

choegyumin / APIError.ts

Last active April 5, 2023 09:30

`HTTPError` (Not Working!)

	/** Server-side */
	interface APIErrorDTO {
	code: string;
	message: string;
	}

	/** @todo Fix types */
	interface APIErrorArguments {
	error: unknown;
	status: number;

choegyumin / maybe.ts

Created November 20, 2019 08:06

TypeScript Monads (Maybe, Just, Nothing)

	class Maybe<T> {
	public value: T \| null \| undefined;

	constructor(value?: T) {
	this.value = value;
	}

	public fmap<R>(transform: (value: T) => R \| null \| undefined): Just<R> \| Nothing {
	if (this.value === undefined \|\| this.value === null) { return new Nothing(); }
	return Maybe.fromNullable<R>(transform(this.value));

choegyumin / event.namespace.js

Last active April 27, 2021 11:07

Namespacing Event Listener in Vanilla Javascript (:see_no_evil: Monkey Patch)

	(function () {
	'use strict';

	EventTarget.prototype.on = function (event, listener, options) {
	if (arguments.length < 2)
	throw new TypeError("Failed to execute 'on' on 'EventTarget': 2 arguments required, but only " + arguments.length + " present.");

	var typeOfListener = typeof listener;
	if (typeOfListener !== 'function' && typeOfListener !== 'object')
	throw new TypeError("Failed to execute 'on' on 'EventTarget': The callback provided as parameter 2 is not an object.");

choegyumin / date.extend.js

Last active April 27, 2021 11:07

Extending feature (add, format) for Date object in Vanilla Javascript (:see_no_evil: Monkey Patch)

	(function () {
	'use strict';

	var MONTHS_NAME = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
	var DAYS_NAME = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; // Weekdays
	var DEFAULT_FORMAT = 'YYYY-MM-DDTHH:mm:ssZ';
	var FORMAT_REGEX = /\[.*?\]\|Y{2,4}\|M{1,4}\|D{1,2}\|d{1,4}\|H{1,2}\|h{1,2}\|a\|A\|m{1,2}\|s{1,2}\|Z{1,2}\|SSS/g;
	var STRIP_BRACKETS_REGEX = /\[\|\]/g;

	Date.prototype.addDate = function (value) { // Day

choegyumin / html-parser.js

Last active September 19, 2018 12:58

CodeSpitz 3기 3회차 과제

	const elementProperties = (input) => {
	input = input.trim();
	const hasAttrs = input.indexOf(' ') + 1;
	if (!hasAttrs) return {name: input, attributes: {}};
	const inputAttrs = input.substring(hasAttrs, input.length).trim();
	const length = inputAttrs.length;
	const attrs = {};
	let i = 0;
	while (i < length) {
	const start = i;

choegyumin / multiplication-table.js

Last active September 14, 2018 08:42

CodeSpitz 3기 2회차 과제