Typescript Sort Array Of Objects By Property

Don't check for NaN using the equality operator. Before we look at the Array object itself the associative array deserves consideration in its own right. Otherwise, the value undefined will be used as its this value. This means that rather than compare types by checking whether or not they both inherit the same base constraint object (like instanceof), the properties of each object are compared. Object Equality in JavaScript. Now that we have a simple Array of numbers, we use Math. Arrays and ArrayList in C#. The sort() method sorts the elements of an array in place and returns the sorted array. let indentedString = padLeft("Hello world", true); // passes at compile time, fails at runtime. Example: An array of objects, each with a numeric row and/or column property. A property has a key (also known as "name" or "identifier") before the colon ":" and a value to the right of it. The order of the sort objects depicts the order in which the columns are sorted. iterator property. How array sort works in typescript Use of readonly array sort function return type case sensitive sortings Comparer function How array sort works in typescript Let us see how we can sort an array in typescript. If you are working on Angular with TypeScript, here are the most frequently used snippets for Angular with Typescript embedded in Visual Studio Code. Typescript also brings with quite a bunch of features of object-oriented programming. var array1:string[] = ["element1","element2","elementN"]; CodesJava Easy learning with example program codes. The default sort order is built upon converting the elements into strings, then comparing their sequences of UTF-16 code units values. Arrays are used to store the multiple values under a one collection name. Sorting Single-Dimension Arrays. Closing Request. In addition to using an map-like object, there has been an actual Map object for some time now, which is available in TypeScript when compiling to ES6, or when using a polyfill with the ES6 type-definitions: let people = new Map(); It supports the same functionality as Object, and more, with a slightly different syntax:. Array: Use an array if you need more than one object property to determine the sorting order. The fact-holder object is a JSON object with the key being the name of the fact to be accessed in the spreadsheet and the value being the array of instance-objects. The Property parameter of the Sort-Object cmdlet accepts an array (more than one) of properties upon which to sort. Remember: arrays are normal objects and their. array of objects stores objects. Updating properties of an object in React state. For example, use 'label' to sort by a property called label or 'label. However we can use a comparer function as the argument of the 'sort' method to get the sorting implemented. Creating an empty array is super easy:. But I'd like to iterate over that from the most occurring to the least occurring. TypeScript - Array filter() - filter() method creates a new array with all elements that pass the test implemented by the provided function. [method name] allows you to define/overwrite an objects method * needle is the item you are searching for * this is a special. …Properties are pieces of meta information about the object…we can retrieve and use. Remember: arrays are normal objects and their. I can now use this type definition to declare a variable and then load all the positions in that variable with data using an array literal:. let planets: Array = [];. For example, there might be a need to generate a report for a specific date range. Using object literals. Order an array of objects based on another array order - mapOrder. Array sorts are often misunderstood by both beginners and intermediate developers. In this example, we will be sorting the edges by their cost, or distance from the src (source) vertex to the dst (destination) vertex. Bracket notation allows access to property names stored in a variable, and must be used if an object’s property contains any sort of special character. An optionsCaption binding is used to set a caption of the preselected value in the list. Grouping elements in array by multiple properties. ts and the one I added manually. Array is a data structure used for storing collection of variables of the same type. By default, webpack will polyfill each library if there is a known polyfill or do nothing if there is not one. desc: Boolean Sorts the selector field in descending order. data normally does. For example you want to order it by the color name, in alphabetical order: black, red, white. // custom-object. iterator property already implemented. of objects and a property of one of the objects and return the list order by the property the user. Not entirely. There are lots of possibilities for use cases, parsing date objects, checking lengths of arrays, if properties exist on an object you passed through, and so forth. Writing AngularJS 1. Presumably you want to sort them on one of start or end: jobs. What is an Array of Objects? Unlike traditional array which store values like string, integer, Boolean, etc. Objects, as generic blobs of values, can be used to build all sorts of data structures. Always use object! Note that in JavaScript, function values are objects: They have properties, have Object. The default sort function compares the items in the array as strings, but you can pass a custom function to sort() if you want to sort an array of objects by a property of the objects:. - [Instructor] I mentioned that arrays are objects. filter returns a new array, though. But what if you need to sort an array of custom objects? The following code stanza shows an array (items) that will be populated with instances of a custom JavaScript object (MyItem). This means typeclasses can use the same function name for completely non-related functionality. JSON return type is an array of objects. Today we'll be looking at another facet: how object equality works. The compare function compares all the values in the array, two values at a time (a, b). When comparing 40 and 100, the sort() method calls the compare function(40, 100). CollectionViewSource is a class which we can use in WPF for filtering and sorting a bounded list. We have generic types, array types and type assertions. To sort an array, you need a comparator function. So this is really the same problem as before!. I'd rather change a visible: true/false boolean in each of the objects, so I can order them with a CSS flexbox setup :). Array-like objects look like arrays. Example of a rule that tells something is possible, but not advisable or has a caveat is no-for-in-array rule. They represent the real power of arrays. Active 3 months ago. Grouping elements in array by multiple properties. TypeScript - Array sort() - sort() method sorts the elements of an array. Hence, the use of variables is not feasible when one needs to store a larger collection of values. Using the built in Array. This means that I can sort on the process name, and then sort on the working set of memory that is utilized by each process (for example). Andy Van Slaars. substring(0, 3)' to sort by the first 3 characters of the label property. Each key/value pair is separated by a comma. If an object literal has any properties that the “target type” doesn’t have, you’ll get an error:. Summary: Learn how to add, modify, or verify values in a Windows PowerShell array, and discover two easy techniques for sorting your array. length; /* try getting a different result. " abbreviation in front of every user's name. We can use Array. \$\begingroup\$ Why not just sort the array based on those values Create object-properties from an array. If two or more anonymous object initializers in an assembly specify a sequence of properties that are in the same order and that have the same names and types, the compiler treats the objects as instances of the same type. Angular 2 Search and Sort with ngFor repeater with example angular 2 sort table angular 2 search pipe angular 2 orderby pipe angular 2 orderby alphabetical angular 2 sort array of objects angular 2 orderby pipe example the pipe 'orderby' could not be found typescript sort array. The above code now accepts a keyField which allows us to use this function to convert any array of objects. The --fix option on the command line automatically fixes problems (currently mostly whitespace) reported by rules which have a wrench below. First i want to sort on age, next on the name. In other words, TypeScript is JavaScript plus some additional features. Create Immutable Object and Array using Typescript. Sort an object's keys, including an optional key list immutable, optimized path-based object property / array accessors array typescript 166 projects;. JSON objects are written in key/value pairs. The for-in loop is used to loop through the properties of an object. The ordering of the properties is the same as that given by looping over the properties of the object manually. To select a whole column, set row to null; to select a whole row, set column to null. In this post I look at JavaScript object iteration and picking out values from a JavaScript object by property name or index. Rewriting JavaScript: Converting an Array of Objects to an Object. For example, use '"special name"' (note the extra pair of quotes) to sort by a property called special. js pro tips – working with observable arrays Recently, I have been blogging mainly about Web API, but many people have been asking me about Knockout. desc: Boolean Sorts the selector field in descending order. TypeScript tutorial for object oriented programmers. get_declared_traits — Returns an array of all declared traits; get_object_vars — Gets the properties of the given object; get_parent_class — Retrieves the parent class name for object or class; interface_exists — Checks if the interface has been defined; is_a — Checks if the object is of this class or has this class as one of its parents. Of course we will need to do some sort of clean-up. [method name] allows you to define/overwrite an objects method * needle is the item you are searching for * this is a special. It uses json keyword with pipe operator to convert any expression result into JSON string. hasOwnProperty('NaN'); // true NaN; // NaN. js object hash library with properties/arrays sorting to provide constant hashes Latest release 2. keys()) over the properties of the object. An ordered list of values. Displaying an object will also require converting the value of each object to a string. Sort an Array of Objects by Multiple Fields with Ramda's sortWith. JavaScript : find an object in array based on object's property (and learn about the "find" function) Published on March 20, 2017 March 20, 2017 • 281 Likes • 41 Comments Rafael Mariano de. The function calculates 40 - 100 (a - b), and since the result is negative (-60), the sort function will sort 40 as a value lower than 100. Sort Javascript arrays by multiple properties. Syntax var filteredArray = array. Writing AngularJS 1. In other words, TypeScript is JavaScript plus some additional features. I showed this up here cuz it's not technically in JavaScript yet, it is progressing along nicely. Given an array of keys, I need to filter an object. Hi folks, in this article, we will use Typescript to create immutable object and array. initialize an object in TypeScript is to do it in can be very bad as it sort of defeats the safety of TypeScript. Filtering an array of objects. Such blank lines are used as needed to create logical groupings of fields. Arrays cannot provide the ?ready-made? methods for user requirements as sorting, searching, etc. Grouping elements in array by multiple properties. Objects, as generic blobs of values, can be used to build all sorts of data structures. The examples on this page attempt to illustrate how the JSON Data Set treats specific formats, and gives examples of the different constructor options that allow the user to tweak its behavior. An array is an aggregate data structure that is designed to store a group of objects of the same or different types. There are some libraries that are specialized in fast immutable operations (e. Array object in Typescript example program code : A TypeScript Array object represents a collection of elements of the same type. keysIterator(), or something, don't know yet -- verbose, but does what it says) Anyhow, since it's ES7, there's a plenty of time to discuss. length; /* try getting a different result. Need to supply comparator custom code which handles Date comparisons. For this reason, function types are considered to be objects in TypeScript. A simple splice method without elements_list parameter removes the number of elements given by the second parameter starting with the index given by the first parameter. JavaScript and TypeScript allow me to do all sort of things, but that doesn't mean that it is wise to do even if possible. He is the Chief Editor of a Developer Magazine called DNC Magazine. map() function, we take all of our Y values and insert them into a new Array of Numbers. In the last tutorial, we have seen how to remove duplicate elements from the array. For example {name:"M", phone:"1"} predicate will return an array of items which have property name containing "M" and property phone containing "1". Each object can have the following properties: uniqueName. We are using es6 map and filter methods to remove the duplicate objects from an array. TypeScript - Array some() - some() method tests whether some element in the array passes the test implemented by the provided function. The second argument to Find and FindAll is a Predicate instance. AngularJS 1. Now, if the config is an array, we know that there are multiple properties to sort on, making the input a complex array of objects. Today we'll be looking at another facet: how object equality works. entries(obj) - returns an array of [key, value] pairs. ts export class CustomObject { constructor( public someString: string, public someNumber: number ) {} }. The TypeScript Array object is used to store multiple values in a single variable at a time. In computer science, a binary search or half-interval search is a divide and conquer algorithm which locates the position of an item in a sorted array. Using TypeScript ‘Spread’ operator The spread operator can be used to initialize arrays and objects from another array or object. Sort Javascript arrays by multiple properties. Object rest patterns are sort of the dual of object spreads. Creating an empty array is super easy:. This may look good but our problem here is that the need for the team property has been eliminated, so the team property in the newly created object is a waste of space. In the following code, dataObj is a data object updated in the database and returned from the server. When you merge two arrays, where the one array contains a key value, you can save a lot of time by indexing the keys. How can I use lodash to sort an array of objects by more than one nested field? I'd like to request that data = _. TypeScript is a language that adds object-oriented syntactical sugar to JavaScript Object-oriented programming has been so influential that many can't imagine doing things any other way. Array Data Structure Introduction. An array is an aggregate data structure that is designed to store a group of objects of the same or different types. @ForgeableSum once sortProperties called. See the examples below. You might accept a parameter as type object, but will be unable to access any of it’s properties without giving the object any property types. But note that io-ts might make object. Learn how to use Java Array methods and properties. I took that idea and created an ISortable Item and a base class that implemented it. TypeScript on GitHub; More Help Is there any module for angular2 to import and export excel place the path in your scripts in your config file to start using it. Prototypes provide object-oriented features customary to object-oriented programming language. Open the rn-cli. property and the output of a method by specifying array name. Replacing an Array. In this article we examine how to sort one-dimensional arrays using Bubble Sort. The behavior of == versus ===, the order of type coercions, etc. Sorting arrays of objects by property. More generally objects can be sorted based on a property. The Property parameter of the Sort-Object cmdlet accepts an array (more than one) of properties upon which to sort. An object is deemed iterable if it has an implementation for the Symbol. color of the window. It is really easy to index the data using an Object with named properties:. Find and FindAll to perform searches on the array. In practice, that distinction often does not matter, and io-ts will validate an object that is missing a required property if the type of that property is allowed to be undefined. It takes two parameters, one required callback function and an optional object, which will be set as a value of this inside the callback function. When this notation is placed before an object or array, it unwraps the children within, and inserts them right there. array of objects stores objects. We've missed these OO features in Javascript for a long time. In most cases, it is a unique property and not a unique object that is the object of a query. JSON objects are written in key/value pairs. ColumnWidth and Range. Exploiting Generics in TypeScript. Yes, it's not Angular 2 anymore, #itsJustAngular. Because Object. TypeScript is ignorant of this. Don't use for arrays. The elements of an array are stored sequentially in memory. We have generic types, array types and type assertions. Array TypeScript, like JavaScript, allows you to work with arrays of values. An associative array is simply a set of. It is a type of primitive data type that is used to store text data. The properties are implemented as read only properties. This means that I can sort on the process name, and then sort on the working set of memory that is utilized by each process (for example). Arrays cannot provide the ?ready-made? methods for user requirements as sorting, searching, etc. js object hash library with properties/arrays sorting to provide constant hashes Latest release 2. Here's a simple unsorted array of JSON objects: var someArray = [ {. Take for instance, the comparison of two Active Directory user objects. Since they are both attributes, we can use v-bind to handle them: we only need to calculate a final string with our expressions. sort(edges, new SortByCost()) And just like that, the list of Edges is now sorted in ascending (least to greatest) order. In TypeScript the slice() method returns a new array that starts with the index given by the first parameter and continuing for the number of elements given by the second parameter. Iterate over array of objects in Typescript - Stack Overflow. Working with jQuery DataTables DataTables is a powerful jQuery plugin for creating table listings and adding interactions to them. This Kotlin example shows how to sort an ArrayList of a custom object by their given property in Kotlin. You can easily get the value of an array using array. I'm showing an array with items of type 'request' in a table. Order an array of objects based on another array order - mapOrder. Checkout factory. Cut Methods : The Paste and PasteSpecial Methods on the Worksheet Object : The Parent Property on All Objects. While calling sort() by itself simply sorts the array in lexicographical (aka alphabetical) order, the sky's really the limit once you go beyond the surface. This works well for strings ("Apple" comes before "Banana"). object Description: Use different data for the different data types requested by DataTables (filter, display, type or sort). It consists of a set of objects usually called nodes that have two properties - data and successor. This methods sorts the array based on the value of the property shown in that column. Here is the sample Any easy way to split an Arraylist into multiple lists based on a property of the objects?. Exploiting TypeScript Arrays. A list of hierarchies selected in the report slice for columns. In class group of objects which have common properties. filter(callback [, contextObject]) Parameters callback The callback function to use contextObject Object to be used as a context for the callback function. AngularJS: Different Ways of Using Array Filters To search on a nested property we can name our input field ng-model to match the target property path and use the root object name as a. Unfortunately, this doesn't work and the array remains sorted in its original form. In OCaml, unlike TypeScript, users do not need to create a separate. JavaScript ES5 or earlier didn't support classes. We can initialize array with the Array Constructor as shown below. Because Array in TypeScript does not have an interface, I simply add a new TypeScript file and define the same Array class. You can use the sort() method of Array, which takes a callback function, which takes as parameters 2 objects contained in the array (which we call a and b):. Before we look at the Array object itself the associative array deserves consideration in its own right. keys(obj) – returns an array of keys. The default sort order is built upon converting the elements into strings, then comparing their sequences of UTF-16 code units values. // custom-object. Array TypeScript, like JavaScript, allows you to work with arrays of values. Andy Van Slaars. But that's where the similarity. The JavaScript Array filter method creates a new array by filtering out the elements of an existing array using a callback function. For example, instead of [{id: 'abfq-f39f', name…. Kotlin - Sort ArrayList of Custom Objects By Property In the below program, we created a User class with firstName and lastName properties. In the first, you use the type of the elements followed by [] to denote an array of that element type: let list: number[] = [1, 2, 3];. The following code uses an object type literal to specify the return type of the 'MakePoint' function. Objects, as generic blobs of values, can be used to build all sorts of data structures. Unfortunately, this doesn't work and the array remains sorted in its original form. js pro tips – working with observable arrays Recently, I have been blogging mainly about Web API, but many people have been asking me about Knockout. It contains properties, getters/setters, methods, and a constructor. Replacing an Array. An action is typically a plain JavaScript object that has a type property and often some sort of payload. Angular 2 Search and Sort with ngFor repeater with example angular 2 sort table angular 2 search pipe angular 2 orderby pipe angular 2 orderby alphabetical angular 2 sort array of objects angular 2 orderby pipe example the pipe 'orderby' could not be found typescript sort array. The center prop is expected to be [number, number] (a pair of numbers), but TypeScript has inferred the type of INIT_VIEW. that if you have an array of objects and you wish to sort by key then its almost the same, this is an example of one that can sort by. A function that is invoked when the callback returns, whose only parameter is of type {@link Office. Let’s see how simple it is. There’s no real protection against an errant mutation of your application state, violating the basic assumptions of Redux. So what does our backing object look like? Well, it can be defined in a single line of code. desc: Boolean Sorts the selector field in descending order. Some built-in types like Array, Map, Set, String, Int32Array, Uint32Array, etc. Bracket notation allows access to property names stored in a variable, and must be used if an object's property contains any sort of special character. Configure the React Native TypeScript Transformer. Hey, Scripting Guy! I get that arrays are really simple in Windows PowerShell, but it seems that they are so simple that no one ever seems to tell us how to work with them. js pro tips – working with observable arrays Recently, I have been blogging mainly about Web API, but many people have been asking me about Knockout. For example, use 'label' to sort by a property called label or 'label. There are lots of possibilities for use cases, parsing date objects, checking lengths of arrays, if properties exist on an object you passed through, and so forth. Take for instance, the comparison of two Active Directory user objects. In the previous example, we saw how to access an simple Array in AngularJs. TypeScript is a compiler, Flow is a checker Flow shoots for soundness, TypeScript for tool support Flow has non-nullable types as defaults Generics in TypeScript are easier, but less expressive Flow's type system is generally more expressive. mealName is assigned directly in the loop, so there is no need for the additional line like it was in the previous example. In traditional object-oriented code, we might abstract over the two types by creating a hierarchy of types. The Compare-Object cmdlet really shines when you're comparing collections of like objects, and, although it allows you to also compare based on specific object properties, that sometimes leaves a little to be desired. all serve to complicate the subject. For instance:. For plain objects, the following methods are available: Object. You can use the sort() method of Array, which takes a callback function, which takes as parameters 2 objects contained in the array (which we call a and b):. The "extends": "eslint:recommended" property in a configuration file enables rules that report common problems, which have a check mark below. sort() (TypeScript types included) Sort objects by property names using native Array. Copy Array of Arrays by Value If you apply the slice or ( concat ) method to an array whose elements are themselves arrays, the sub-arrays are copied by reference. let planets: Array = [];. TypeScript: Working with JSON Sat, Mar 19, 2016. Unfortunately, you cannot access nested arrays with this trick. How to check if an object is an array? 7453. A map is a type that associates values to keys. js object hash library with properties/arrays sorting to provide constant hashes Latest release 2. Note: This property is a subproperty of an array-valued property. This method is a property of all JavaScript objects; and to use it, you simply pass in a string with the name of the key for which you are checking. It can be used for initializing an array or object from another array or object. from(arrayLike, mapFunc?, thisArg?) # Array. In addition to using an map-like object, there has been an actual Map object for some time now, which is available in TypeScript when compiling to ES6, or when using a polyfill with the ES6 type-definitions: let people = new Map(); It supports the same functionality as Object, and more, with a slightly different syntax:. In this article, I am describing some of the TypeScript array methods. keys() to get an array of the object's keys, and then get the length of that. The compare function compares all the values in the array, two values at a time (a, b). Since the window doesn't have a style object the function fails miserably and produces JavaScript errors. They represent the real power of arrays. Typescript also brings with quite a bunch of features of object-oriented programming. To search a particular object, we will use the Array prototype find method. ts and the one I added manually. keysIterator(), or something, don't know yet -- verbose, but does what it says) Anyhow, since it's ES7, there's a plenty of time to discuss. Sort(Array) with the array as a paramater. Bracket notation allows access to property names stored in a variable, and must be used if an object’s property contains any sort of special character. Sorting an array of objects by multiple fields can be tricky. For example, use 'label' to sort by a property called label or 'label. The following code demonstrates the Sort and Sort method overloads on a simple business object. Object means this a real world entity. There are lots of possibilities for use cases, parsing date objects, checking lengths of arrays, if properties exist on an object you passed through, and so forth. And rightfully so, because it is one of the most robust Javascript client side technology right now. Typescript inherits this feature from ES6. Rewriting JavaScript: Converting an Array of Objects to an Object. Assigning to an undefined property of an object will create that property on the object. See the examples below. These methods help developers write clean and readable code. Using generics, we make a generalized function for different data types, instead of creating separate functions for each data type. An array in PHP is actually an ordered map. Array Type Inteface. I'm showing an array with items of type 'request' in a table. When you merge two arrays, where the one array contains a key value, you can save a lot of time by indexing the keys. You might accept a parameter as type object, but will be unable to access any of it's properties without giving the object any property types. TypeScript's Type System Lazy Object Literal Initialization Create Arrays. from(arrayLike, mapFunc?, thisArg?) # Array. TypeScript is a compiler, Flow is a checker Flow shoots for soundness, TypeScript for tool support Flow has non-nullable types as defaults Generics in TypeScript are easier, but less expressive Flow's type system is generally more expressive. About a month ago, Microsoft released the 0. mealName is assigned directly in the loop, so there is no need for the additional line like it was in the previous example. map(field => { title: fromAPI. If you set updateOn to 'blur' at the array level, all child controls default to 'blur', unless the child has explicitly specified a different updateOn value. Creating arrays. Sort an Array of Objects by Multiple Fields with Ramda's sortWith. sort() can be used on them directly. TypeScript supports tools for large-scale JavaScript applications for any browser, for any host, on any OS. Of course we will need to do some sort of clean-up. The ordering of the properties is the same as that given by looping over the properties of the object manually. Learn JavaScript tutorial for beginners and professionals covers fundamentals, uses of javascript, purpose of javascript, javascript validation, javascript dom objects, java objects, control statements and more. Typescript Array object has many properties and methods which help developers to handle arrays easily and efficiently. …In JavaScript, objects have properties and methods. 1's mapped types verify that all the keys in the idFields array were actually properties of the object. You can use the sort() method of Array, which takes a callback function, which takes as parameters 2 objects contained in the array (which we call a and b):. NET Framework -- instead, it has just arrays and tuples. Before we look at the Array object itself the associative array deserves consideration in its own right. 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: