投稿時間:2022-04-02 22:20:05 RSSフィード2022-04-02 22:00 分まとめ(26件)

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js	JavaScriptタグが付けられた新着投稿 - Qiita	Vue3注目の新機能 Reactivity Transformとは？	https://qiita.com/__Nem__/items/59e6e7fa8fe169fd5bca	※reactivityとは、その値に変更を加えたとき、それに依存する値が自動的に更新されるような性質のことである。	2022-04-02 21:53:15
js	JavaScriptタグが付けられた新着投稿 - Qiita	Cloud Functions で GmailAPI で メールを送信する方法 [Javascript]	https://qiita.com/YmBIgo/items/f3c260a9e927b2466efb	CloudFunctionsを用意するを参考にして、CloudFunctionsの有効化・関数の作成を行いますPythonの部分は、Nodejsに書き換えて下さい。	2022-04-02 21:31:30
Ruby	Rubyタグが付けられた新着投稿 - Qiita	定数だけを切り出したファイルを作り、複数クラスで使えるようにする	https://qiita.com/takumi555/items/e25d3381263afb2d7d20	定数だけを切り出したファイルを作り、複数クラスで使えるようにするやりたいことrailsで定義した定数を他のクラスでも使いたいとき、クラス名定数名のように書くと思う。	2022-04-02 21:57:33
Docker	dockerタグが付けられた新着投稿 - Qiita	Proxy環境下のWSL2でDockerを動かす	https://qiita.com/yasuaki-344/items/e2d6b0ab38722faba6b5		2022-04-02 21:23:28
Ruby	Railsタグが付けられた新着投稿 - Qiita	定数だけを切り出したファイルを作り、複数クラスで使えるようにする	https://qiita.com/takumi555/items/e25d3381263afb2d7d20	定数だけを切り出したファイルを作り、複数クラスで使えるようにするやりたいことrailsで定義した定数を他のクラスでも使いたいとき、クラス名定数名のように書くと思う。	2022-04-02 21:57:33
海外TECH	MakeUseOf	3 Quick Ways to Combine Photos Into a Collage on macOS	https://www.makeuseof.com/combine-photos-into-collage-macos/	collage	2022-04-02 12:15:13
海外TECH	DEV Community	Flutter complete interview questions with answers	https://dev.to/shaileshmishra/flutter-complete-interview-questions-with-answers-3d7k	Flutter complete interview questions with answersThese questions and answers are collected from different resources on the internet like stackoverflow medium and other github repositories What is the difference between a StatelessWidget and a StatefulWidget in Flutter Stateless WidgetA stateless widget can not change their state during the runtime of an app which means it can not redraw its self while the app is running Stateless widgets are immutable Stateful WidgetA stateful widget can redraw itself multiple times while the app is running which means its state is mutable For example when a button is pressed the state of the widget is changed Explain the Stateful Widget Lifecycle The lifecycle has the following simplified steps createState mounted trueinitState didChangeDependencies build didUpdateWidget setState deactivate dispose mounted false What is Flutter tree shaking flutter web When compiling a Flutter web application the JavaScript bundle is generated by the dartjs compiler A release build has the highest level of optimization which includes tree shaking your code Tree shaking is the process of eliminating dead code by only including code that is guaranteed to be executed This means that you do not need to worry about the size of your app s included libraries because unused classes or functions are excluded from the compiled JavaScript bundle What is a Spacer widget Spacer manages the empty space between the widgets with flex container Evenly with the Row and Column MainAxis alignment we can manage the space as well What is the difference between hot restart and hot reload What is Hot Reload in Flutter Flutter hot reload features works with combination of Small r key on command prompt or Terminal Hot reload feature quickly compile the newly added code in our file and sent the code to Dart Virtual Machine After done updating the Code Dart Virtual Machine update the app UI with widgets Hot Reload takes less time then Hot restart There is also a draw back in Hot Reload If you are using States in your application then Hot Reload preservers the States so they will not update on Hot Reload our set to their default valuesWhat is Hot Restart in Flutter Hot restart is much different than hot reload In Hot restart it destroys the preserves State value and set them to their default So if you are using States value in your application then After every hot restart the developer gets fully compiled application and all the states will set to their defaults The app widget tree is completely rebuilt with new typed code Hot Restart takes much higher time than Hot reload What is an InheritedWidget Why is the build method on State and not StatefulWidget What is a pubspec file in Dart The pubspec file manages the assets and dependencies for a Flutter app How is Flutter native Flutter uses only the canvas of the native platform and draws the UI and all the components from scratch All the UI elements look the same as native ones This mainly reduces the burden of time for converting through some language to the native one and speeds up the UI rendering time As a result the UI performance is remarkably high What is a Navigator and what are Routes in Flutter Navigation and routing are some of the core concepts of all mobile application which allows the user to move between different pages We know that every mobile application contains several screens for displaying different types of information For example an app can have a screen that contains various products When the user taps on that product immediately it will display detailed information about that product What is a PageRoute Allow us to add animation transaction to the route Explain async await and Future Async means that this function is asynchronous and you might need to wait a bit to get its result Await literally means wait here until this function is finished and you will get its return value Future is a type that comes from the future and returns value from your asynchronous function It can complete with success then or withan error catchError how can you update a listview dynamically By using setState to update the listview item source and rebuild the UI What is a Stream A stream is like a pipe you put a value on the one end and if there s a listener on the other end that listener will receive that value A Stream can have multiple listeners and all of those listeners will receive the same value when it s put in the pipeline The way you put values on a stream is by using a StreamController What are keys in Flutter and when should you use it You don t need to use Keys most of the time the framework handles it for you and uses them internally to differentiate between widgets There are a few cases where you may need to use them though A common case is if you need to differentiate between widgets by their keys ObjectKey and ValueKey can be useful for defining how the widgets are differentiatedAnother example is that if you have a child you want to access from a parent you can make a GlobalKey in the parent and pass it to the child s constructor Then you can do globalKey state to get the child s state say for example in a button press callback Note that this shouldn t be used excessively as there are often better ways to get around it feature emb title What are GlobalKeys GlobalKeys have two uses they allow widgets to change parents anywhere in your app without losing state or they can be used to access information about another widget in a completely different part of the widget tree An example of the first scenario might if you wanted to show the same widget on two different screens but holding all the same state you d want to use a GlobalKey When should you use mainAxisAlignment and crossAxisAlignment When can you use double INFINITY When you want the widget to be big as the parent widget allow What is Ticker Tween and AnimationController Animation SequencesTo achieve sequence animation we ll introduce a new Widget that also helps with reducing animation code called AnimatedBuilder which allows you to rebuild your widget through a builder function every time a new animation value is calculated What is ephemeral state What is an AspectRatio widget used for AspectRatio Widget tries to find the best size to maintain aspect ration while respecting it s layout constraints The AspectRatio Widget can be used to adjust the aspect ratio of widgets in your app How would you access StatefulWidget properties from its State Using the widget property Mention two or more operations that would require you to use or turn a Future Calling api using http Getting result from geolocator package With FutureBuilder widget What is the purpose of a SafeArea SafeArea is basically a glorified Padding widget If you wrap another widget with SafeArea it adds any necessary padding needed to keep your widget from being blocked by the system status bar notches holes rounded corners and other creative features by manufactures When to use a mainAxisSize When you use MainAxisSize on your Column or Row they will determine the size of the Column or Row along the main axis i e height for Column and width for Row SizedBox VS Container List the Visibility widgets in flutter and the differences Visibility Opacity Offstage danle sdev widget hide and seek a guide to managing flutter widgets visibility dcbaf Can we use Color and Decoration property simultaneously in the Container NoThe color property is a shorthand for creating a BoxDecoration with a color field If you are adding a box decoration simply place the color on the BoxDecoration Inorder for the CrossAxisAlignment baseline to work what is another property that we need to set crossAxisAlignment CrossAxisAlignment baselinetextBaseline TextBaseline ideographic when should we use a resizeToAvoidBottomInset If true the body and the scaffold s floating widgets should size themselves to avoid the onscreen keyboard whose height is defined by the ambient MediaQuery s MediaQueryData viewInsets bottom property For example if there is an onscreen keyboard displayed above the scaffold the body can be resized to avoid overlapping the keyboard which prevents widgets inside the body from being obscured by the keyboardWith resizeToAvoidBottomInsetwithout resizeToAvoidBottomInset What is the difference between as show and hide in an import statement What is the importance of a TextEditingController Whenever the user modifies a text field with an associated TextEditingController the text field updates value and the controller notifies its listeners Listeners can then read the text and selection properties to learn what the user has typed or how the selection has been updated Why do we use a Reverse property in a Listview List animals cat dog duck List reversedAnimals animals reversed toList Difference between a Modal and Persistent BottomSheet with an example How is an Inherited Widget different from a Provider Provider basically takes the logic of InheritedWidgets but reduce the boilerplate to the strict minimum What is an UnmodifiableListView Cannot change the list items by adding or removing Difference between these operators and expr exprIf expr is non null returns its value otherwise evaluates and returns the value of expr Like but the leftmost operand can be null example foo bar selects property bar from expression foo unless foo is null in which case the value of foo bar is null What is the purpose of ModalRoute of ModalRoute of method This method returns the current route with the argumentsfinal args ModalRoute of context settings arguments Difference between a Navigator pushNamed and Navigator pushReplacementNamed Difference between a Single Instance and Scoped Instance Difference between getDocuments vs snapshots What is a vsync Vsync basically keeps the track of screen so that Flutter does not renders the animation when the screen is not being displayed When does the animation reach completed or dismissed status animations that progress from to will be dismissed when their value is An animation might then run forward from to or perhaps in reverse from to Eventually if the animation reaches the end of its range the animation reaches the completed status Difference between AnimationController and Animation AnimationController is for how long the animation would be and how to control from time upper and lower boundary how to control data with time length sequence etc while AnimationTween is for the range of animation with time colour range sequence etc as long the animation would be while When to use a SingleTickerProviderStateMixin and TickerProviderStateMixin Define a TweenAnimation Short for in betweening In a tween animation the beginning and ending points are defined as well as a timeline and a curve that defines the timing and speed of the transition The framework calculates how to transition from the beginning point to the end point State the importance of a Ticker Ticker is the refresh rate of our animations This is what we want to pause when our clock is hidden A bonus for using Ticker is that this allows the dev tool to “slow our animation If we use “Slow animations then our clock is slowed by This is a good sign as it means it will be a lot easier to test our clock Why do we need a mixins Mixins are very helpful when we want to share a behavior across multiple classes that don t share the same class hierarchy or when it doesn t make sense to implement such a behavior in a superclass When do you use the WidgetsBindingObserver To check when the system puts the app in the background or returns the app to the foreground Why does the first flutter app take a very long developing time When you are going to build the Flutter app for the first time it takes a very long time than usual because Flutter builds a device specific IPA or APK file In this process the Xcode and Gradle are used to build a file which usually takes a long time Define what is an App State The App State is also called an application state or shared state The app state can be distributed across multiple areas of your app and the same is maintained with user sessions Following are the examples of App State Login infoUser preferencesThe shopping cart of an e commerce application What are the two types of Streams available in Flutter Single subscription streams It is a popular and common type of stream It consists of a series of events that are parts of a large whole Here all events have to be delivered in a defined order without even missing a single event It is a type of stream that you get when you get a web request or receive a file This stream can only be listed once Listing it again and again means missing initial values and overall stream makes no sense at all When the listing starts in this stream the data gets fetched and provided in chunks Broadcast streams This stream is meant for the individual messages that can be handled one at a time These types of streams are commonly used for mouse events in a browser You can list this type of stream at any time Multiple listeners can listen at a time and also you have a chance to listen after the cancellation of the previous subscription What do you know about Dart Isolates To gain concurrency Dart makes use of the Isolates method which works on its own without sharing memory but uses passing or message communication What is a Flutter inspector Flutter inspector is a tool that helps in visualizing and exploring the widget trees It helps in understanding the present layout and diagnoses various layout issues Stream vs Future The difference is that Futures are about one shot request response I ask there is a delay I get a notification that my Future is ready to collect and I m done whereas Streams are a continuous series of responses to a single request I ask there is a delay then I keep getting responses until the stream dries up or I decide to close it and walk away How to compare two dates that are constructed differently in Dart What s the difference between async and async in Dart Debug vs Profile mode In debug mode the app is set up for debugging on the physical device emulator or simulator Debug Assertions are enabled Service extensions are enabled Compilation is optimized for fast development and run cycles but not for execution speed binary size or deployment Debugging is enabled and tools supporting source level debugging such as DevTools can connect to the process ProfileIn profile mode some debugging ability is maintainedーenough to profile your app s performance Profile mode is disabled on the emulator and simulator because their behavior is not representative of real performance On mobile profile mode is similar to release mode with the following differences Some service extensions such as the one that enables the performance overlay are enabled Tracing is enabled and tools supporting source level debugging such as DevTools can connect to the process How to convert a List into a Map in Dart What does non nullable by default mean Expanded vs Flexible Why is exit not preferred for closing an app What is the difference between main function and the runApp function in Flutter In Dart main acts as the entry point for the program whereas runApp attaches the given widget to the screen What is Dart and why does Flutter use it Dart is AOT Ahead Of Time compiled to fast predictable native code which allows almost all of Flutter to be written in Dart This not only makes Flutter fast virtually everything including all the widgets can be customized Dart can also be JIT Just In Time compiled for exceptionally fast development cycles and game changing workflow including Flutter s popular sub second stateful hot reload Dart makes it easier to create smooth animations and transitions that run at fps Dart can do object allocation and garbage collection without locks And like JavaScript Dart avoids preemptive scheduling and shared memory and thus locks Because Flutter apps are compiled to native code they do not require a slow bridge between realms e g JavaScript to native They also start up much faster Dart allows Flutter to avoid the need for a separate declarative layout language like JSX or XML or separate visual interface builders because Dart s declarative programmatic layout is easy to read and visualize And with all the layout in one language and in one place it is easy for Flutter to provide advanced tooling that makes layout a snap Developers have found that Dart is particularly easy to learn because it has features that are familiar to users of both static and dynamic languages Where are the layout files Why doesn t Flutter have layout files In the Android framework we separate an activity into layout and code Because of this we need to get references to views to work on them in Java Of course Kotlin lets you avoid that The layout file itself would be written in XML and consist of Views and ViewGroups Flutter uses a completely new approach where instead of Views you use widgets A View in Android was mostly an element of the layout but in Flutter a Widget is pretty much everything Everything from a button to a layout structure is a widget The advantage here is in customisability Imagine a button in Android It has attributes like text which lets you add text to the button But a button in Flutter does not take a title as a string but another widget Meaning inside a button you can have text an image an icon and pretty much anything you can imagine without breaking layout constraints This also lets you make customised widgets pretty easily whereas in Android making customised views is a rather difficult thing to do What is the difference between final and const in Flutter final means single assignment A final variable or field must have an initializer Once assigned a value a final variable s value cannot be changed final modifies variables const has a meaning that s a bit more complex and subtle in Dart const modifies values You can use it when creating collections like const and when constructing objects instead of new like const Point Here const means that the object s entire deep state can be determined entirely at compile time and that the object will be frozen and completely immutable Const objects have a couple of interesting properties and restrictions They must be created from data that can be calculated at compile time A const object does not have access to anything you would need to calculate at runtime is a valid const expression but new DateTime now is not They are deeply transitively immutable If you have a final field containing a collection that collection can still be mutable If you have a const collection everything in it must also be const recursively They are canonicalized This is sort of like string interning for any given const value a single const object will be created and re used no matter how many times the const expression s are evaluated	2022-04-02 12:08:47
海外TECH	DEV Community	What is your favorite nosql database and why?	https://dev.to/saptakbhoumik/what-is-your-favorite-nosql-database-and-why-2mef	database	2022-04-02 12:03:57
海外TECH	DEV Community	Devs for friends, advisers, collaborators	https://dev.to/martins0023/collaborators-5c9p	Devs for friends advisers collaboratorsLet s build something I been working with python Django framework for web dev for sometimes now I m working on a project currently it s a kind of all these crypto websites but I m using some APIs for the development of the project such as the buying and selling and receiving of coins and the exchange rate changes I really don t know if it s a cool project tho but I know it s awesome anyway I m just looking for collaborators not sort of collaborators tho but actually devs that has been in this world of tech for a very long time they re experienced enough to know what it s gonna be like they ve gone through this process actually What process I m I talking about developing on their own they know what it looks like working alone they know how tedious it is when they re no advisers when you re going through developing alone I don t mind Devs that can be friends for advising or putting me through some tangled stuffs Thanks	2022-04-02 12:01:13
Apple	AppleInsider - Frontpage News	Daily deals April 2: $130 Apple Smart Keyboard Folio, $101 Logitech StreamCam Plus, more	https://appleinsider.com/articles/22/04/02/daily-deals-april-2-130-apple-smart-keyboard-folio-101-logitech-streamcam-plus-more?utm_medium=rss	Daily deals April Apple Smart Keyboard Folio Logitech StreamCam Plus moreSaturday s top deals include the Apple Smart Keyboard Folio for the inch iPad Pro for an assortment of refurbished iPads and iPad Pros the Nanoleaf Canvas Smarter Kit for and more Deals for April Every day we scour every corner of the internet to find the best tech deals available including discounts on Apple products tech accessories and a variety of other items all to help you save some cash If an item is out of stock you may still be able to order it for delivery at a later date Many of the discounts are likely to expire soon though so act fast Read more	2022-04-02 12:44:02
海外TECH	CodeProject Latest Articles	Complex Math Parser and Evaluator in VB.NET	https://www.codeproject.com/Articles/5328357/Complex-Math-Parser-and-Evaluator-in-VB-NET	expression	2022-04-02 12:59:00
海外ニュース	Japan Times latest articles	50 years after return to Japan, gap remains between Okinawa and rest of country	https://www.japantimes.co.jp/news/2022/04/02/national/okinawa-gap-rest-of-japan/	years after return to Japan gap remains between Okinawa and rest of countryAmong the country s prefectures Okinawa s average income per capita has stayed at the bottom since fiscal and the prefecture s child poverty rate stands	2022-04-02 21:48:50
海外ニュース	Japan Times latest articles	Experts warn of a new wave of COVID-19 as cases rise across Japan	https://www.japantimes.co.jp/news/2022/04/02/national/japan-coronavirus-tracker-april-2/	Experts warn of a new wave of COVID as cases rise across JapanThe number of new coronavirus cases confirmed in a week through Friday increased in of the country s prefectures according to the government data	2022-04-02 21:18:45
ニュース	BBC News - Home	Dover queues due to shortage of cross-Channel ferries	https://www.bbc.co.uk/news/uk-england-kent-60965245?at_medium=RSS&at_campaign=KARANGA	dover	2022-04-02 12:34:49
ニュース	BBC News - Home	Camilla says she voted for Rose on Strictly during EastEnders set visit	https://www.bbc.co.uk/news/uk-60964838?at_medium=RSS&at_campaign=KARANGA	wales	2022-04-02 12:08:23
ニュース	BBC News - Home	West Ham 0-2 Manchester City: Shaw seals win for Champions League chasers	https://www.bbc.co.uk/sport/football/60883926?at_medium=RSS&at_campaign=KARANGA	West Ham Manchester City Shaw seals win for Champions League chasersManchester City move level on points with third placed Manchester United in the Women s Super League after a routine win over West Ham	2022-04-02 12:38:09
ニュース	BBC News - Home	'England have belief to win World Cup' - Watch extended interview with Gareth Southgate	https://www.bbc.co.uk/sport/av/football/60967495?at_medium=RSS&at_campaign=KARANGA	x England have belief to win World Cup x Watch extended interview with Gareth SouthgateManager Gareth Southgate says his England side have the belief to win the World Cup but insists getting out of the group stages is the goal that his squad shouldn t lose sight of	2022-04-02 12:41:10
ニュース	BBC News - Home	Daniil Medvedev: Russian out for one to two months to have hernia surgery	https://www.bbc.co.uk/sport/tennis/60966957?at_medium=RSS&at_campaign=KARANGA	Daniil Medvedev Russian out for one to two months to have hernia surgeryRussian world number two Daniil Medvedev says he will be out for one to two months after deciding to have surgery on a small hernia	2022-04-02 12:52:34
北海道	北海道新聞	コロナ臨時医療施設の利用低迷　２７道府県で使用率１０％以下	https://www.hokkaido-np.co.jp/article/664758/	医療施設	2022-04-02 21:27:00
北海道	北海道新聞	コンサドーレ６戦連続ドロー　浦和と１―１	https://www.hokkaido-np.co.jp/article/664757/	連続	2022-04-02 21:21:00
北海道	北海道新聞	フィンランド、ＮＡＴＯ排除せず　ロシア侵攻「安全保障変えた」	https://www.hokkaido-np.co.jp/article/664755/	北大西洋条約機構	2022-04-02 21:12:22
北海道	北海道新聞	日本代表、厳しい組み合わせ歓迎　権田「やりがい」と前向き	https://www.hokkaido-np.co.jp/article/664756/	組み合わせ	2022-04-02 21:10:00
北海道	北海道新聞	水中の春見つけて　札幌・サンピアザ水族館で特別展	https://www.hokkaido-np.co.jp/article/664709/	札幌市厚別区	2022-04-02 21:05:33
北海道	北海道新聞	北海道キャンピングカーフェス始まる　軽乗用タイプやワゴン車１００台　札幌	https://www.hokkaido-np.co.jp/article/664740/	車台	2022-04-02 21:01:44
仮想通貨	BITPRESS（ビットプレス）	[日経] 暗号資産のビットフライヤーHD、投資ファンドが買収へ	https://bitpress.jp/count2/3_9_13145	投資ファンド	2022-04-02 21:53:26
海外TECH	reddit	T1 vs. Gen.G / LCK 2022 Spring Playoffs - Final / Post-Match Discussion	https://www.reddit.com/r/leagueoflegends/comments/tuhokp/t1_vs_geng_lck_2022_spring_playoffs_final/	T vs Gen G LCK Spring Playoffs Final Post Match DiscussionLCK SPRING PLAYOFFS Official page Leaguepedia Liquipedia Eventvods com New to LoL T Gen G Congratulations to T on winning their th LCK title and being the MSI Korean representative Finals MVP Oner GEN Leaguepedia Liquipedia Website Twitter Facebook YouTube T Leaguepedia Liquipedia Website Twitter Facebook YouTube MATCH GEN vs T Winner T in m Damage Graph Runes Bans Bans G K T D B GEN lee sin jayce ahri viego tryndamere k O H C B T zeri twisted fate hecarim corki galio k H I I I GEN vs T Doran ornn TOP camille Zeus Peanut volibear JNG nocturne Oner Chovy viktor MID ryze Faker Ruler ezreal BOT caitlyn Gumayusi Lehends karma SUP lux Keria MATCH GEN vs T Winner Gen G in m Damage Graph Runes Bans Bans G K T D B GEN jayce caitlyn hecarim renekton kennen k I O C C B T zeri karma twisted fate rakan renata glasc k H H B GEN vs T Doran akali TOP lucian Zeus Peanut lee sin JNG diana Oner Chovy ahri MID ryze Faker Ruler xayah BOT jinx Gumayusi Lehends alistar SUP nautilus Keria MATCH T vs GEN Winner T in m Damage Graph Runes Bans Bans G K T D B T hecarim ryze karma malphite rakan k H H B O O GEN zeri caitlyn twisted fate nautilus zilean k HT C O B O T vs GEN Zeus jayce TOP camille Doran Oner viego JNG lee sin Peanut Faker ahri MID leblanc Chovy Gumayusi jinx BOT xayah Ruler Keria tahmkench SUP yuumi Lehends MATCH GEN vs T Winner T in m Runes Bans Bans G K T D B GEN caitlyn jayce karma tryndamere nautilus k O I T zeri twisted fate hecarim malphite camille k H H C B C GEN vs T Doran akshan TOP kennen Zeus Peanut lee sin JNG viego Oner Chovy ryze MID ahri Faker Ruler xayah BOT jinx Gumayusi Lehends yuumi SUP thresh Keria Patch This thread was created by the Post Match Team submitted by u adzr to r leagueoflegends link comments	2022-04-02 12:24:20