Rxjs Oftype Multiple

identity]) source npm package. Sign in Sign up Instantly share code, notes. The concept of reactive programming is currently thriving. It depends on your preference which one to choose, but I think NGXS is more Angularish and I will try to show you why you should choose it, too. Help Request Help Chaining Dependent Save Operations Within An RxJS Effect (self. Oftype vs cast. So we have injectable CardsEffects, which use the @Effect decorator for defining effects on top of our Actions and filtering only necessary actions by using the ofType operator. Although there is much overlap between implementations, there are also some operators that are only implemented in certain implementations. com,2014:Post/effectively-managing-side-effects-in-angular. In terms of scalability we can split Epics or compose Epics based on particular tasks. Last month, I describe a way to manage global state with ngrx/store. x Web supports auth handlers chaining. The data is then published through it's IObservable interface to all subscribed observers. We'll need to have a look into the performance and to find a way to speed it up. So, you want to do polling to a server using NgRx? I assume you want to wait for each server response before sending new request, and also you want your code to be readable and preferably testable?. It also has a RxJS operator ofType, which is used to filter actions based on their action type. Again, ofType associates the effect with an action while tap performs a side effect transparently. Because the store is an Observable, this means that every time the list of names in the store is updated, our local variable which is subscribed to it (which is bound to the display on the UI page) will change too. Redux-Observable allows you to get all of the reactive programming awesomeness that comes with using RxJS while handling side effects in your Redux. In this simple example it's quite easy. * Emits the latest action _after_ the action has passed through all reducers. There's an ant task to run all migrations in a project from an ant scrip= t. If you’re using RxJS v5. Component Interaction in Angular Mar 29, 2017 One of the more interesting topics to delve into in Angular is comparing and contrasting the way directives and components communicate with one another in both OG Angular. What we do on line number 14, is the next step,…we get access to actions, which is a service from NgRx. Consuming this data can be overwhelming, like trying to drink directly from the fire hose. com/default. Reactive Programming简介与教学(以RxJS为例) The introduction to Reactive Programming you’ve been missing. Learn more about Teams. Problem I have is that since the store is imported into this directive, need to make copy of directive for each store. Just to be clear, if we have a quick look at the implementation of this, you can see that ofType is indeed just using a regular RxJS filter, and it accepts multiple types. Setup a private space for you and your coworkers to ask questions and share information. I had originally felt that anyone using redux-observable should already be familiar with RxJS's operator patching but it turns out a lot of people's experience with it was importing all of RxJS via import Rx from 'rxjs' so they never noticed that it has this ability that we let you take advantage of, if you want. Understanding NgRx Effects and the Action Stream. Introduction. From(array)'s array allow function element if TakeExceptLast's count under 0 then return all sequence. Using RxJS, developers represent asynchronous data streams with Observables, query asynchronous data streams. replaceEpic: Added middleware method to replace the root Epic. In this example, when the LOGIN_SEND_SUCCESS action occurs from anywhere in the application, we make a request to the server to fetch the user's customizations given their userId, which has been attached to the payload of this action. rxjs-marbles. Beyond a bit of initial bootstrapping of one vs the other, the dev experience is pretty similar. With RxJS not only does it provide a Observable class for us to use but also several subtypes with different properties. NET implementations which can be. When I first started using these tools, it took quite a bit of time and a lot of experimentation to figure out a good process. In languages like C# and Java, one of the main tools in the toolbox for creating reusable components is generics, that is, being able to create a component that can work over a variety of types rather than a single one. You may use ofType to create an effect that will be fired on multiple action types. type === CREATE_TASK). GitHub Gist: star and fork jayphelps's gists by creating an account on GitHub. These days, everyone expects real time functionality across multiple devices, and RxJS is a great way to make that happen. They want their tweets now. switchMap could cancel a request if the. Now it’s time to focus on actions, reducers and effects. A full list can be found on the RxJS website. It's currently the most popular way to structure. Note: @ngrx/store is a RxJS powered state management inspired by Redux for Angular apps. ofType() The core concepts / architecture is the same - reducers to manage state, action creators that you dispatch, etc. x Web supports auth handlers chaining. This operator can be used as either a static or instance method! If order not throughput is a primary concern, try concat instead!. 9http://www. Useful when I want multiple actions to complete before moving on to the next step. Commit Score: This score is calculated by counting number of weeks with non-zero commits in the last 1 year period. However, it might be hard to follow the concept that “everything is stream”, and this article should help you to get a basic understanding of Observables. Oftype operator. Redux is a tiny library, but its contracts and APIs are carefully chosen to spawn an ecosystem of tools and extensions, and the community has created a wide variety of helpful addons, libraries, and tools. Learn more about Teams. In order to accomplish this, I am going to explain the things you need to know and understand about ngrx and then…. /~/process/browser. The first line. What makes switchMap() different is that it returns only the most recent observable's value in a stream of observables. EffectSources is an internal class that acts as an rxjs Subject and emits all actions from your effects to the store. dispatch more than one action, you can use Rx. 2 (2016-07-14) Bug Fixes. An intersection type combines multiple types into one. Always handle errors. Q&A for Work. The goal of Angular components is to be completely independent. It executes the run callback for each of those navigation, and it does it in a synchronized fashion to avoid race conditions. But when multiple bundles are generated, the runtime code is extracted into the common module, here the vendor file. It also has a RxJS operator ofType, which is used to filter actions based on their action type. x, and that has not changed in Angular 2. That is the question! There appears to be some confusion on the web about whether or not Subject should be used, ever. Now it’s time to focus on actions, reducers and effects. I have a seemingly simple question that I would be surprised if had not been asked before, but I'm having trouble finding anything. We live in the information age. In the example I put the second. With GraphQL you could argue I’ve been using it since be. I don't want to maintain this module anymore since I just use minimist, the argument parsing engine, directly instead nowadays. Does anyone have a solution for automating unit testing of R packages under various multiple versions of R and/or prerequisite packages? Python has a nice package, tox, which allows the user to write a configuration file specifying what dimensions to expand over, then it runs testing under all combinations of those. viewmodel automatically set datacontext of view. Setup a private space for you and your coworkers to ask questions and share information. This is your one stop shop introduction to get oriented to the world of reactive programming. The IObservable interface does not make any assumptions about the number of observers or the order in which notifications are sent. That's why we had to add some boilerplate to do it ourselves. Learn more about Teams. Since 2000, he's focused on full-stack projects. Very cool! #angular. C# is an object oriented, strongly-typed language. Next we need to create our adapter. GitHub Gist: star and fork jayphelps's gists by creating an account on GitHub. Why Rx? Users expect real time data. RxJS: Subjects, Behavior Subjects & Replay Subjects A subject in Rx is a special hybrid that can act as both an observable and an observer at the same time. org/schemas/sitemap/0. To provide enriched and sufficient amount of data to Loklak, Loklak Server should have multiple sources of data. The magic happens in the Observable. NET application using the MVC model (if you don't know yet what it is, read here) is the emphasis put to th How to specify custom paths to the ASP. After some time I tried nx from @nrwl_io again. Photo by Sarah Dorweiler on Unsplash Writing and refactoring FizzBuzz in NgRx with maintainability in mind. Это почти то же самое, и это вопрос вкуса между генераторами и RxJS. We hope …. @ngrx/effects API EffectsModule. Learn more about Teams. Angular Dependency Injection Dependency Injection (DI) was a core feature in Angular 1. r/ngrx is for news and discussion about the NgRx open source project for Angular. A basic knowledge of NgRx is needed to follow the examples. Oftype in c#. Additionally, some of the rxjs code needs to be repeated. Try it out! Some ad blockers can block the form below. You may use ofType to create an effect that will be fired on multiple action types. @NetanelBasal I am trying to use this in he ngrx4 example app. callOne(); }). adapter: An adapter object which can transform the input/output streams provided to your epics, Usually used to adapt a stream library other than RxJS v5, like adapter-rxjs-v4 or adapter-most Options:. At any given time, a given provider may have zero, one, or multiple observers. Once that completes, the map() returns a new action. Maybe could use the RxJs reduce operator. These are the heart and soul of your NgRx code and will be the ones you use most on a day to day basis. A library to handle realtime SignalR events using angular and rxjs. So it is indeed called once. A library to handle realtime SignalR events using angular and rxjs. Combining multiple Http streams with RxJS Observables in Angular2. It is part of several operators that are used for reactive programming. With the store, we manage the overal state of the Angular application in a single global object. Try it out! Some ad blockers can block the form below. Multiple branches Migrating projects that use multiple branches has a few additional chall= enges. Although there is much overlap between implementations, there are also some operators that are only implemented in certain implementations. Maybe to create a alternative view engine to replace the XML and XSLT based view engine somewhen. Data is not always valuable is its raw form. You want to have the result pushed to you when it is ready. switchMap() is an rxJS operator. For example we can use the adapter to add an item to our collection or multiple items or perform CRUD operations. The ofType operator allows for multiple types. So, if you're using Angular, then you're already using RxJs. Это почти то же самое, и это вопрос вкуса между генераторами и RxJS. But first, let me introduce myself… 2 3. Stream Thinking Of Rxjs RxJS is a library which is powerful on dealing asynchronous programming, and Angular2 uses it by default. 1 Mateusz Gajewski Solutions Architect @ Allegro Kraków Office Opening • February 2015 allegrotech. With RxJS 5. Part 3: Let’s build an Angular app using reactive programming with RxJS and ngrx. Last month, I describe a way to manage global state with ngrx/store. You want to have the result pushed to you when it is ready. It also has a RxJS operator ofType, which is used to filter actions based on their action type. Learn Redux in Angular with NgRx Store You will probably agree with me, that angular applications can become quite hard to overlook as they become bigger. Q&A for Work. It also helps to take a look at the RxJS documentation at the Reactivex Overview site and Angular's Documentation on RxJS. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. There is no functional difference between effects loaded by forRoot() and forFeature() ; the important difference between the functions is that forRoot() sets up the. It takes advantage of RxJS to provide observable streams. If you want the last emission any time a variable number of observables emits, try combinelatest!. Ngrx/effects: Complex stream with nested actions depending on another February 09, 2017 Here is a case I faced using the great ngrx/store & effects libraries to take care of my data. Sometimes you want to dispatch multiple actions from an epic. We use cookies to ensure that we give you the best experience on our website. For those of you who don't know what Redux is, it is a predictable state container for JavaScript apps. It wraps the RxJS TestScheduler and provides methods similar to the helper methods used the TestScheduler API. Observables is a new primitive type which acts as a blueprint for how we want to create streams, subscribe to them, react to new values, and combine streams together to build new. Learn more about Teams. Sometimes we need to consolidate, collate, combine or condense the mountains of data we receive into more consumable bite sized chunks. Like What You've Read? Subscribe to the Blog. You're using the RxJS operator exhaustMap which will cancel incoming requests when there is already one request running. This comes from spending a lot of time. There are times when you want to support multiple authN/authZ mechanisms in a single application. Sometimes you want to dispatch multiple actions from an epic. A Basic Example. I’ve recently been trying out om. It also has a RxJS operator ofType, which is used to filter actions based on their action type. See yargs for the modern, pirate-themed successor to optimist. dll Represents a dynamic data collection that provides notifications when items get added, removed, or when the whole list is refreshed. Because the store is an Observable, this means that every time the list of names in the store is updated, our local variable which is subscribed to it (which is bound to the display on the UI page) will change too. This post is part of a series on building a MEAN app using TypeScript with Angular Material and Reactive programming. r/Angular2 exists to help spread news, discuss. You may use ofType to create an effect that will be fired on multiple action types. Here, we will learn the process of working with arithmetic operators like +,-,,*,/ in Android and UWP using Xamarin. I am attempting to perform some logic on an object I select from the store. We hope …. Ordering matters in Configure method, so first piece of code inside of the method will process the request first. With RxJS 5. Before we look at our first real-world example, I wanted to show you how we would test the above example with just rxjs and marble diagrams. More importantly than being able to write platform independent code is the ability to substitute in a test-double scheduler/timer to enable testing. Angular Architecture for scalable Angular applications Paweł Żurowski 2018-01-09 3. Their order confirmed now. I know this approach is popular and also (kind of) suggested by the RxJS creators / maintainers, but I don't like it at all because it breaks the "don't make me think"-guideline. This can be done with the takeUntil() RxJS operator:. appsthink web development and programming blog for C language,Python,Java,Javascript,Html,Css,Android,IOS,Windows. With the store, we manage the overal state of the Angular application in a single global object. The strict type checking in C#, both at compile and run times, results in the majority of typical C#. If you want the last emission any time a variable number of observables emits, try combinelatest!. Check out the Using Migration with branching documentation for details. In my NgRx Tutorial, I wrote about setting up NgRx in your Angular 6 application. 0 Xbox 360 support. Reducing a sequence. If you can update to TypeScript 2. js from the import. md Created Aug 31, 2017 — forked from fernandohu/Reading configuration files before application startup in Angular2 final release. Hi, my name is Bonnie Brennan. It is really important to have a separate configuration for all the hardcoded URLs having multiple instances across the project. We should keep our Configure method clean and in the case of having large chunks of code that are processing request we should move those to our middleware. net MVC, spring MVC, code igniter etc. Aggregation. These patterns provide solutions to common problems, and are usually built on top of the…. All gists Back to GitHub. Generics introduce to the. They both are state management libraries for Angular application. Data is being created, stored and distributed at a phenomenal rate. Ordering matters in Configure method, so first piece of code inside of the method will process the request first. In the above epic, we filter for actions with type 'SOME_ACTION' using the. A typical effect uses the actions Observable as its source and uses the ofType operator to only perform its side effect when the corresponding action is dispatched. Oftype multiple. webpack accepts configuration files written in multiple programming and data languages. You may use ofType to create an effect that will be fired on multiple action types. DEPRECATION NOTICE. One or more action types can be provided to the pipeable stream. I don't want to maintain this module anymore since I just use minimist, the argument parsing engine, directly instead nowadays. Previously I’ve been using GraphQL and Relay pretty much since they came out. Zip and Enumerable. Jan 6, 2017 · 2 min read. Learn more about Teams. Reducing a sequence. ofType() returns an observable which watches for newly dispatched events that match the type of the action. NET implementations which can be. Sometimes you want to dispatch multiple actions from an epic. Learn more about Teams. So, my question: Is there a way to dispatch multiple redux actions in a single Epic?. Redux-Observable is an amazingly powerful middleware for Redux using RxJS. At the time they were working on NgRx - the types for redux were pretty bad, but they have come along way - and there wasn't as many 'clean' ways of exposing the store as an Observable. The ofType operator allows for multiple types. Using rxjs sample within redux-observable to listen to other actions I'm using redux-observable to act as the middleware between dispatching actions and the store. json endpoint of loklak server is used in Loklak to post the search result object to server. RxJS introduces Observables, a new Push system for JavaScript. As a developer, you demand fire-and-forget messaging. This means that we're now ready to start learning about RxJS itself. An archive of the CodePlex open source hosting site. Decorator that marks a class property or method as an effect. x config improvements. Explore Important Features Of HTTP Client With RxJs Operators Feb 06, 2019. adapter: An adapter object which can transform the input/output streams provided to your epics, Usually used to adapt a stream library other than RxJS v5, like adapter-rxjs-v4 or adapter-most Options:. They're lightweight, will make your code easily re-usable and can decrease your overall build size. Removed conflict of EnumerableEx. The objective of this article is to provide a clean and clear introduction to ngrx. NgRx 5 and Schematics. Managing state is one of the hardest problems when building front-end applications. It is part of several operators that are used for reactive programming. js-jQuery , linq. Must be called multiple times for each effect class you want to run. differenceBy(array, [values], [iteratee=_. To prevent this, we need extract out the runtime into a separate manifest file. It would also be possible to have multiple view engines. The first line. So by using the store and some helpful RxJS operators, namely switchMap, withLatestFrom, and forkJoin, I was able solve my issue of combining multiple observables in a single NgRx effect and. 0 brings support for RxJS v6 and Redux v4. It is really important to have a separate configuration for all the hardcoded URLs having multiple instances across the project. As in the case of sagas, we can dispatch multiple actions each one describing at what part of the API request chain the thread. This allows us to exclude the. An intersection type combines multiple types into one. 构建流式应用—RxJS详解. x then you will use an ES6-style import of the exported function, for example: import { switchMap } from "rxjs/operators"; How do I chain operators? Again, the answer varies based on the version of RxJS that you are using. Their order confirmed now. mergeMap: Map values by combining multiple Observables into one by merging their emissions. В документе redux есть руководство для асинхронных действий, таких как setTimeout. Sometimes we need to consolidate, collate, combine or condense the mountains of data we receive into more consumable bite sized chunks. WHEN IS REDUX USEFUL? SPA with complex data flow (and sophisticated UI) Multiple views/routes that share data Multiple components that must be in sync (with no parent relationship) Scalability Testability Simplify debug Consistently: run in di erent environments (client, server, and native) 31 / 89 32. A library to handle realtime SignalR events using angular and rxjs. import { Actions, Effect, ofType } from. Multiple branches Migrating projects that use multiple branches has a few additional chall= enges. RxJS - Javascript library for functional reactive programming. #!bin/sh # Configure homebrew permissions to allow multiple users on MAC OSX. NET implementations which can be. 按字母顺序排列的全部操作符列表. In the end, however, you need to deploy your new shiny app. 9http://www. Now it’s time to focus on actions, reducers and effects. These are the heart and soul of your NgRx code and will be the ones you use most on a day to day basis. NET Added XNA 4. Sometimes you want to dispatch multiple actions from an epic. But the more you understand RxJS, the easier it is to create an Epic. # Any user from the admin group will be able to manage the homebrew and cask installation on the machine. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Find some RxJS operators from the link. other than removal of deprecated code in version 4 and bumping the minimum version of RxJS for pipeable operator support. Build your Pokédex: Part 1 - Introduction to NgRX • 10th July 2019 • 24 min read This post is part of a Series of post on which I'm describing how to build your Pokédex using NGRX from beginner to ninja, if you want to read more, you can read the following posts:. As a developer, you demand fire-and-forget messaging. Now customize the name of a clipboard to store your clips. There are two ways of syncing state that I know of. Setup a private space for you and your coworkers to ask questions and share information. ofTypeが推論されると、引数とofType後のActionがなんであるか確定し、payloadが補完されるようになるので便利です。 サンプルプロジェクト. binding for Reactive Extensions for JavaScript(RxJS) and IntelliSense Generator -> see documentation NuGet install support( linq. x) and the newer versions (2+). A library to handle realtime SignalR events using angular and rxjs. WHEN IS REDUX USEFUL? SPA with complex data flow (and sophisticated UI) Multiple views/routes that share data Multiple components that must be in sync (with no parent relationship) Scalability Testability Simplify debug Consistently: run in di erent environments (client, server, and native) 31 / 89 32. The Reactive Extensions for JavaScript (RxJS) is a set of libraries for composing asynchronous and event-based programs using observable sequences and fluent query operators that many of you already know by Array#extras in JavaScript. 5 of RXJS introduced the pipe method, which is used to compose a number of functions to act on the observable. share and synchronize a common (Ngrx-based) state between multiple connected clients, and; distribute real-time (Ngrx-based) actions across multiple connected clients, which impact local states/reducers. From(array)'s array allow function element if TakeExceptLast's count under 0 then return all sequence. Problem I have is that since the store is imported into this directive, need to make copy of directive for each store. DEPRECATION NOTICE. * Represents an observable of all actions dispatched to the store. One or more action types can be provided to the pipeable stream. RxJava - introduction & design 1. From(array)) optimized performance Grouping optimized performance Enumerable. Essentially, what we are doing above is creating multiple observers to the observable, with each effect being an observer. About the authors Florent Pillet is an author of this book. Added Windows Phone 7 support. Check out the Using Migration with branching documentation for details. js), heh - though RxJava is rather more popular and mature in java land I guess with things like RxVertx (Vert. Angular Architecture for scalable Angular applications Paweł Żurowski 2018-01-09 3. Using node-interpret, webpack can handle many different types of configuration files. switchMap could cancel a request if the. RxJS introduces Observables, a new JavaScript push system. Q&A for Work. Once that completes, the map() returns a new action. If you want the last emission any time a variable number of observables emits, try combinelatest!. viewmodel automatically set datacontext of view. An Observable is a Producer of multiple values, "pushing" them to Observers (Consumers). ofType() returns an observable which watches for newly dispatched events that match the type of the action. In this article we will build a fully-functional file upload control, that is powered by Angular and is backed by an NgRx feature store. Angular is Google's open source framework for crafting high-quality front-end web applications. One or more action types can be provided to the pipeable stream. x introduced the lettable operator syntax using the Observable. Это почти то же самое, и это вопрос вкуса между генераторами и RxJS. Angular Dependency Injection Dependency Injection (DI) was a core feature in Angular 1. Their order confirmed now. …The first thing we do on line 15, is filter. But because it uses RxJS it is much more declarative and you utilize and expand your existing RxJS abilities. We can use the RxJs operator mapTo to achieve this. We hope …. If we look at the source code, we'll see that under the hood ofType uses filter operator of rxjs library, meaning that this. So if 26 weeks out of the last 52 had non-zero commits and the rest had zero commits, the score would be 50%. If you want the last emission any time a variable number of observables emits, try combinelatest!. Additionally, some of the rxjs code needs to be repeated. Ordering matters in Configure method, so first piece of code inside of the method will process the request first. Usage: actions$. RxDart is a reactive functional programming library for Google Dart, based on ReactiveX. A full list can be found on the RxJS website. 聚合器并不如分流器常用, 所以 RxJS 没有实现聚合器的操作符。. Useful for code splitting and hot reloading ; replaceEpic: Dispatches an EPIC_END action when you replaceEpic() 0. I'm looking for way of dispatching multiple redux actions in a single Epic of redux-observable middleware. Oftype in c#. 666 is thus another way to write 154. So it is indeed called once. I don't want to maintain this module anymore since I just use minimist, the argument parsing engine, directly instead nowadays. ofType('LOGIN', 'LOGOUT'); Effect. 5 came the introduction of pipeable, or "lettable", operators. Sometimes you want to dispatch multiple actions from an epic. For instance what if you want to both update the UI with the returned data, and trigger a subsequent async data retrieval. Create an observable with given subscription function. Find some RxJS operators from the link. switchMap: When an Observable emits multiple Observables then the latest emitted Observable result is mapped by. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: