wafrat (Page 2)

Using Priority Queues on LeetCode in JavaScript and TypeScript to avoid `Time Limit Exceeded`

A lot of problems on LeetCode require the use of a Priority Queue. Without it, even though your implementation works, it will not be efficient enough and the submission might fail with the dreaded "Time Limit Exceeded", passing only 980 out of 1000 tests. Solving questions without a Priority Queue

flutter

Fixing `because every version of firebase_ui_localizations depends on flutter_localizations from sdk which depends on intl 0.18.0, firebase_ui_firestore >=1.0.1 requires intl 0.18.0.

Today my Flutter app started breaking with the following error: because every version of firebase_ui_localizations depends on flutter_localizations from sdk which depends on intl 0.18.0, firebase_ui_firestore >=1.0.1 requires intl 0.18.0. So, because [project] depends on both intl ^0.17.

flutter

Fixing `ld: file not found: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_iphoneos.a`

Today my Flutter app failed to build in iOS with this error: ld: file not found: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_iphoneos.a Googling will send you to StackOverflow posts with 1001 ways to supposedly fix it with obscure scripts and no explanation.

firebase functions

Make Prettier work nicely with ESLint in VSC

These days I am writing Firebase Functions, and I encountered this issue where VSC will fix formatting for me, but when I try to deploy the function, ESLint complains. I had this import in my code: import { IncomingMessage } from "node:http"; VSC is set up so that Prettier will format

flutter

Reverse geocoding in Flutter

There are so many packages that do reverse geocoding on pub.dev that it is hard to pick. geocode: nope The very first result is geocode. At first sight it seems ok. It has 90 likes, 98% popularity, the last update is rather recent (7 months ago) and it is

flutter

Fixing `Error: Method not found: 'FallThroughError'. load_bundle_task_state.dart:17 throw FallThroughError();, Target kernel_snapshot failed: Exception`

This error came from ~/.pub-cache/hosted/pub.dev/cloud_firestore_platform_interface-5.9.1/lib/src/platform_interface/utils/load_bundle_task_state.dart. I tried a flutter clean. Then recompiled but it still threw the error. I have run flutter pub upgrade --major-versions, then flutter pub outdated to make

gpt-3

GPT-3 can really code

After struggling for hours to write a Firebase Function that would proxy GET requests to another server, and all the noise that GPT has been generating, I tried to make it come up with the same code. Results Amazingly, it was able to come up with nice initial versions. But

firebase functions

Enabling CORS in Firebase Functions

After struggling really hard to make a simple proxy in Firebase Functions (see my post), I realized I also needed to enable CORS. CORS Documentation Let's take a look at the documentation over at MDN. Apparently, if I want to whitelist any domain, I could set the response header: Access-Control-Allow-Origin:

firebase functions

Using fetch in Firebase Functions in TypeScript

Yesterday I needed to make some kind of proxy for my project. Basically, I needed to make an endpoint that makes a GET request to another server, and return the result. I had heard of Firebase Functions and decided to write it in that. The meat of the code should

flutter

Passing a threshold for screenshot tests in Flutter

Since this was much harder than expected, I figured I should document it for future reference, and also in order to refine the solution as I get used to it. The regular way to screenshot tests is to write: await expectLater(find.byType(MaterialApp), matchesGoldenFile('goldens/render_$description.png')); However

flutter

Using records and other Dart 3 features in Flutter

Dart 3 alpha recently got announced here. It introduces new features like records (tuples) which I wanted to use. The article also mentions the latest version of Flutter stable ships with Dart 3 alpha. Enabling experimental features in VSC To use it, we should change the pubspec.yaml to use

flutter

Testing a DropdownButton

It is quite difficult to write UI tests for a DropdownButton. Thanks to this StackOverflow post, I was able to extract a minimal test. Here's the snippet: imports... void main() { testWidgets( 'Selects a civilization', (WidgetTester tester) async { final picker = CivilizationPicker(...); await tester.pumpWidget(MaterialApp(home: Scaffold(body: picker))); // Opens the

flutter

Track screen names in Flutter with Firebase Analytics

My starting point was this doc: https://firebase.google.com/docs/analytics/screenviews. It sounds promising because they say they will track page views automatically. And indeed it did. I didn't even have to call FirebaseAnalytics.instance. However, on the Google Analytics dashboard, I don't get any meaningful screen name:

How to do `text-transform: uppercase` in Flutter TextStyles?

Short answer, you can't. See this ticket. So the workaround is to use toUpperCase(): Scaffold( appBar: AppBar( title: Text('Game plan review'.toUpperCase()), ), body: ... )

dart

Iterating two lists at the same time in Dart

It'd be nice to be able to run this kind of loop iterable.map((e) => ...) on two iterables at the same time. I really like the iterable.map syntax because most times, I only care about the actual element values, not the indices. What if I have two iterables of

dart

Setting custom values to Enums in Dart

I do not remember where I got it from, but yes, it's possible. This sample shows all there is to know about it: https://github.com/atn832/kanji_dictionary/blob/2d9b2332303440ac6858040394ed6cf91c05d964/lib/src/book.dart Lazy post. Hope it helped! :)

Getting started with Pixel Art

Here is what I've learned from https://www.coursera.org/learn/pixel-art-video-games. You can audit the class for free by clicking "Enroll for free", then choosing "Audit for free". I am using piskelapp.com. It's free and really well made. Unlike Photoshop where you need to pick the right presets

flutter

Fixing `DVTPortalServiceErrorDomain: Your session has expired` in Flutter for iOS

These days my iOS app updates for Flutter keep randomly failing with the following error: DVTPortal: Error: Error Domain=DVTPortalServiceErrorDomain Code=1100 "Your session has expired. Please log in." It used to be about once every 5 builds, but then it became 100% of them failing with that error. So

korean

Making a list of Korean vocabulary for beginners

I've found that the biggest deterrent for using my Flashcards app was that it came with no content. So I decided to make a few lists of words for beginners. I really like KANJIDIC's list of Kanji tagged with which grade Japanese students study them. So I looked for a

dart

Converting a List<int> to a String in Dart

I first tried using this: String.fromCharCodes But it mangled the UTF-8 encoding, even though the doc mentions something about UTF-16. For example, it mangled: 亜 Into: äº It turns out I should have used this instead: import 'dart:convert'; utf8.decode(list);

dart

Profiling a Dart CLI app

I had some trouble finding the docs for it, so I'll give you the right link: * At https://dart.dev/tools/dart-devtools, they link out to Flutter's CPU profiler. * https://docs.flutter.dev/development/tools/devtools/cpu-profiler. There's a few gotchas. First you need to enable the Profiler after the

flutter

Fixing EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK in testWidgets with FutureBuilders

I have a FutureBuilder that checks for errors and displays an error message. I wanted to write a test to check the rendering of the error, but if I passed a Future.error('some error'), the test would fail with this message: ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following

japanese

In which order should I study Kanji?

I recently got back from a trip to Japan and it made me want to learn basic Kanji again. It would help decipher restaurant menus and navigate the city. Besides it's really fun to figure it out. This a-ha feeling never gets old. As soon as I got back home,

japanese

First 1000 Kanji by 21 different books

This data comes from KANJIDIC. Henshall Guide 52 Tuttle Kanji Cards 52 Henshall 239 Sakade 488 Crowley 714 O'Neill's Essential Kanji 960 Kanji & Kana 1231 Kanji & Kana (2011 ed) 1264 Gakken 1389 Kanji in Context 1437 Japanese Kanji Flashcards 1439 Remembering The Kanji 2683 Maniette 2704 Kodansha Compact Kanji Guide

flutter

Fixing the boxes in screenshot tests in Flutter

There are many packages to make screenshot tests in Flutter. I've been using the first-party Flutter tool. See https://api.flutter.dev/flutter/flutter_test/matchesGoldenFile.html. Basic usage As explained, it's pretty straightforward. You write your expectation as: await expectLater(find.byType(MyWidget), matchesGoldenFile('goldens/my_widget.png')); Then