Iām trying to loop through the counties object of object and add two new properties(nameCombined & codeCombined) to the existing Keys (Bucks and Montgomery) I got up till here. But not able to mutate š Here is the Data: Expected Result: Answer You were on the right path with entries and forEach, but if you want to mutate the original
Tag: ecmascript-6
In JS ES6, why is it that if I export default, then I cannot export it individually?
I found that I can do: but I cannot move that default to the top: Why is that? They just seem to serve the same purpose: export Foo as default and individually, but the first form is ok while the second form is not. Answer I can’t quite tell if this is a language quirk, because I never see a
sorting a list alphabetically is not sorting anything at all
I’m trying to take a list of cars and sort them alphabetically. So I found this method to sort: But when I write it out to the console, you can see the results below and they are not alphabetically sorted. What could I be doing wrong? Thanks! Answer Your log seems to imply that this data is from immutable.js. By
How to remove event callback with parameters
I have a web application that page A has video, and page B doesn’t. The video has the onended event when it finishes video playback. I tried to remove the event before the component unmounts with removeEventListener, or the video ended event will be fired after I switched to page B. However, I cannot find the proper way to remove
Typescript – type ‘string’ can’t be used to index type
I’m using Vue.js with TypeScript and have run into some errors when using dynamic object keys. Here is my function: Here are the errors that I get: I’m not entirely sure what the issue is as I have defined the interface ResetStateItems and thought I could just use keyof to make it work? Answer Instead of using the variable name
ReactJS – unable to show stuff on the DOM that is in another component
Hi there I’m a beginner looking for some help. I have made two .js files. One is the App.js and another is a Box component. This is App.js This is my BoxComponent However, for some reason, the paragraphs and input within the boxComp doesn’t render onto the DOM and I can’t seem to figure out why. Somehow, the ‘Helloooo’ manages
Extending Promise base class typings
I am trying to extend Promise base class, with a static method and an instance method. I am having trouble with the typescript definitions. See my code below! With this code, when I try to defined Promise.timeout above, typescript gives me the error : Property timeout is a static member of type PromiseConstructor. If I try to define the typing
How to increase all values of a map in javascript
I have this map: And I want to add this new key/value: How can I increase the values of all the old map elements in 1? So I get the following map: Answer You can use something like this:
Babel with Internet Explorer
Why isn’t this working in IE11 ? I was under the impression that Babel will automatically convert new-style code to old-style. Is there some configuration setup to be done ? Answer Babel can transform language features from newer versions of JavaScript into equivalents in older versions. It can’t polyfill APIs which aren’t supported (like fetch). You would need to find
How to compare an array of objects with an array of strings?
How to compare these arrays? I want to compare and get a result like the below. Array of string Array of object As you can see there is no Sliders categoryName in the array of string. I expected the result should be another array of objects. As the following Thanks! Answer You can use .filter as follows: