Frederik Batuna freddi301

Full-stack Developer JavaScript - TypeScript - React - NodeJS

freddi301 / do_not_cache.http.headers

Created June 15, 2017 08:26

Do not cache HTTTP headers

	Cache-Control: no-cache, no-store, must-revalidate
	Pragma: no-cache
	Expires: 0

freddi301 / TypeFaster.html

Last active September 25, 2019 09:29

Type Faster

freddi301 / curryByNam.js

Created August 30, 2017 08:10

JavaScript + Flow Named Curried Functions

	/* @flow */

	const createPerson = ({}: { name: string, birth: Date, pets: number }): [] => []

	const a = {};
	//createPerson(a);

	const b = { ...a, name: 'fred' };
	//createPerson(b);

freddi301 / veawco.js

Created September 19, 2017 15:12

version aware programming proof of concept

	// @flow

	/// as first we declare the contract our program will have with external world

	type v1Api = {
	getPerson(id: string): v1Person,
	addPerson(person: v1Person): void
	};

	type v1Person = { id: string, name: string, age: number };

freddi301 / index.js

Last active November 3, 2017 13:19

Observables (alternative)

	// alternative observables, knowledge about Observables implemetation is required (ex: RxJs)
	// this is fully type-annoteable (typescript, flowtype)

	// An observer is a function that takes an item from the stream
	// and must return a function that will be called with the next item in the stream
	// this way stateful observers can mantain state in clojures and every instance of them if replayable.
	// observers should not have side effects

	// type Observer<T> = (item: T) => Observer<T>

freddi301 / retry.ts

Created January 4, 2018 12:01

Generic retry function decorator (typescript)

	export function retrySync<Fun extends (...args: any[]) => any, State>({
	fun,
	predicate,
	nextState,
	state
	}: {
	fun: Fun;
	state: State;
	nextState: (state: State) => State;
	predicate: (state: State) => boolean;

freddi301 / singleton.ts

Created February 27, 2018 11:03

singleton

	export function singleton<T>(builder: () => T): () => T {
	let getter = () => {
	const value = builder();
	getter = () => value;
	return value;
	}
	return () => getter()
	}

	const x = singleton(() => { console.log("creating 5"); return 5 })

freddi301 / glider-avatar.svg

Last active March 14, 2018 11:12

My avatar

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freddi301 / do-await.ts

Created May 4, 2018 11:05

TypeScript do notation using await

	class Nothing<T> implements PromiseLike<T> {
	then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 \| PromiseLike<TResult1>) \| undefined \| null, onrejected?: ((reason: any) => TResult2 \| PromiseLike<TResult2>) \| undefined \| null): PromiseLike<TResult1 \| TResult2> {
	return (onrejected as any)(this);
	}
	}
	class Just<T> implements PromiseLike<T> {
	constructor(private value: T) { }
	then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 \| PromiseLike<TResult1>) \| undefined \| null, onrejected?: ((reason: any) => TResult2 \| PromiseLike<TResult2>) \| undefined \| null): PromiseLike<TResult1 \| TResult2> {
	return (onfulfilled as any)(this.value);
	}

freddi301 / lens.ts

Last active December 11, 2018 14:53

Lens in typescript