Chandra Sekhar Kode chandu0101

I heard some points of criticism to how React deals with reactivity and it's focus on "purity". It's interesting because there are really two approaches evolving. There's a mutable + change tracking approach and there's an immutability + referential equality testing approach. It's difficult to mix and match them when you build new features on top. So that's why React has been pushing a bit harder on immutability lately to be able to build on top of it. Both have various tradeoffs but others are doing good research in other areas, so we've decided to focus on this direction and see where it leads us.

I did want to address a few points that I didn't see get enough consideration around the tradeoffs. So here's a small brain dump.

"Compiled output results in smaller apps" - E.g. Svelte apps start smaller but the compiler output is 3-4x larger per component than the equivalent VDOM approach. This is mostly due to the code that is usually shared in the VDOM "VM" needs to be inlined into each component. The tr

Applied Functional Programming with Scala - Notes

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

Building a Maintainable, Agile Architecture for Realtime, Transactional Apps

A maintainable application architecture requires that the UI only contain the rendering logic and execute queries and mutations against the underlying data model on the server. A maintainable architecture must not contain any logic for composing "app state" on the client as that would necessarily embed business logic in the client. App state should be persisted to the database and the client projection of it should be composed in the mid tier, and refreshed as mutations occur on the server (and after network interruption) for a highly interactive, realtime UX.

With GraphQL we are able to define an easy-to-change application-level data schema on the server that captures the types and relationships in our data, and wiring it to data sources via resolvers that leverage our db's own query language (or data-oriented, uniform service APIs) to resolve client-specified "queries" and "mutations" against the schema.

We use GraphQL to dyn

	import "package:flutter/material.dart";
	import "package:google_fonts/google_fonts.dart";
	import "memory_usage.dart" if (dart.library.html) 'memory_usage_web.dart';
	import "dart:async";

	const showMemMonitor = bool.fromEnvironment("SHOW_MEM_MONITOR");

	class MemoryMonitor extends StatefulWidget {
	const MemoryMonitor({super.key});

	/// For dart 2:
	///
	/// ```
	/// import 'package:tuple/tuple.dart';
	///
	/// Future<Tuple2<T1, T2>> zipAsync<T1, T2>(
	/// Future<T1> future1, Future<T2> future2) async {
	/// late T1 result1;
	/// late T2 result2;
	///

	// MIT License
	//
	// Copyright (c) 2021 Simon Lightfoot
	//
	// Permission is hereby granted, free of charge, to any person obtaining a copy
	// of this software and associated documentation files (the "Software"), to deal
	// in the Software without restriction, including without limitation the rights
	// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	// copies of the Software, and to permit persons to whom the Software is
	// furnished to do so, subject to the following conditions:

	// Copyright 2017, the Flutter project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	import 'dart:math';
	import 'package:flutter/material.dart';

	void main() {
	runApp(new MyApp());
	}

	// This file allows us to inspect the traffic going over the Native <-> JS bridge, and can be
	// helpful for debugging. Setting this to true should never be committed to git
	const ENABLE_BRIDGE_DEBUGGER = false; // <-- THIS SHOULD NOT BE TRUE IN MASTER!!!!

	// if true, function arguments will get pretty printed
	const PRETTY_PRINT = false;

	// enable this if you want to ignore EVERY event, except for the ones that match the `FOCUSED_*`
	// constants. If true, you configure what you want to see. If false, you configure what you DONT
	// want to see.

	- (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions {

	// 1. init window
	self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
	UIViewController *rootViewController = [UIViewController new];

	// 2. backgroundView using LaunchScreen.xib
	UIView *backgroundView = [[[NSBundle mainBundle] loadNibNamed:@"LaunchScreen" owner:self options:nil] firstObject];
	backgroundView.frame = self.window.bounds;

	Alternative for http://aperiodic.net/phil/scala/s-99/p21.scala

	def insertAt[A](e: A, n: Int, ls: List[A]) =
	ls.patch(n, List(e), 0)

	insertAt('new,1,li) //> res1: List[Symbol] = List('a, 'new, 'b, 'c, 'd)
	insertAt('new,0,li) //> res2: List[Symbol] = List('new, 'a, 'b, 'c, 'd)
	insertAt('new,99,li) //> res3: List[Symbol] = List('a, 'b, 'c, 'd, 'new)