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kandi X-RAY | javascript-class Summary
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QUESTION
I would like to get a javascript-class that maps children of itself to children.
This is what I got so far:
...ANSWER
Answered 2020-Nov-20 at 20:58Your code works perfectly. I suspect it is in the way you're creating the objects.
Here, I simply provided an id, string as name and send in your children object. Your code, unmodified creates what you expect:
QUESTION
I am currently trying to add a service layer to my NodeJS project, which is a simple API I build using express and sequelize. The project has a structure of the usual model, route, and controller (MRC) form; each has its own directory. Now all I need to do is add another directory that will contain the service files. The files will contain the business logic in the form of a class that I will export and include in my controller files.
Here I will display the controller and service files:
eruptionController.js
...ANSWER
Answered 2020-Aug-30 at 17:26You should return a promise function for getting the then function inside it. There is a issue in your service it should be like the below snippet
QUESTION
I've read this article. https://justinfagnani.com/2015/12/21/real-mixins-with-javascript-classes/
here is the original code of JavaScript from the article:
...ANSWER
Answered 2020-Jul-28 at 01:49You can use chaining, since otherwise all Mixins would have to have the same return signature using generics:
QUESTION
This is actually a merge of three differents questions already all well answered here on stack overflow !
1 - How to Dynamic Load a JavaScript file from inside a Js Script :
2 - How to Dynamic Load Jquery
3 - SetTimeout inside a JS Class using this
Basically, I am building a class that will inject some pages inside my clients's website.
To do so, the client just need to add my script src on the page.
...ANSWER
Answered 2019-May-26 at 20:25That's the solution I've found:
// MyClass.js
QUESTION
I currently have a function called resetThenSet like so
...ANSWER
Answered 2019-Feb-05 at 01:33class youDidntTellUs extends Component {
async resetThenSet(id, arrayId, title){
let size = [...this.state[arrayId]]
//blah blah blah
}
render(){
return (
this.resetThenSet()}
/>
...
QUESTION
I create a AngularJS factory following the tutorial of
https://medium.com/opinionated-angularjs/angular-model-objects-with-javascript-classes-2e6a067c73bc
The problem is, a new object is not being created and the value got updated to previous object, here is my code
...ANSWER
Answered 2018-Oct-24 at 17:19_data is a shared object between the two instances of Transaction, it's behaving exactly as it should, every time you instantiate a new Transaction the id is overriding the previous, and you will always end up with the last one.
To get what is supposed to be the desired behaviour make _data an instance field.
QUESTION
I've got a fairly elaborate class which uses the old-style way of creating classes. Rather than using the class keywords, classes are defined using the function keyword. To create public properties, you assign this.publicProperty. My code works quite well.
However, when I try to use the Closure Compiler (a JS minifier tool) in advanced mode, I get bazillions of errors, starting with one about 'dangerous' references to this. Here's a trivial example which illustrates my problem. I try to compress this trivial JS code:
...ANSWER
Answered 2018-Mar-02 at 03:56Summarizing the edits and discussion below: Closure compiler relies on annotations as instructions. So annotating the constructor function (per below) is a start. Next, it is also necessary to realize that any code that is not used by any of the other code you are compiling at the same time will be treated as dead code and will be removed by the compiler. This doesn't work well for custom APIs such as yours. So the final fix (also below), is to record a reference to the function on the window object using array type property access notation ( [] ).
Edit I missed an important detail. deferring to Chad's comment below, since you are using advanced mode, Chad says: If you use ADVANCED mode there is a separate issue - the constructor is never used therefore it is removed as dead code. So please make sure you constructor is addressed within your code.
Edit 3 To fix the issue Chad references (his name is splattered all over the bug reports!), the next step is to add your function to the global scope. It appears it resides in the global anyway, so this is not big issue (unless you correct me).
window['myClass'] = myClass;
====
To solve your problem, you must annotate your code correctly. It sounds as if that may not be the case. Here is a relevant snippet from the docs:
@constructor
Marks a function as a constructor. The compiler requires a @constructor annotation for any function that is used with the new keyword. @constructor should be omitted from EcmaScript class constructor methods and goog.defineClass constructor methods.
With this code sample:
QUESTION
Basically I'm wondering whether it is possible to redefine a method at class level, not instance level, as sought here.
Just to make clear, also, I want to be able to call the original method (on this) from within the enhanced/replacement method.
I tried implementing the chosen answer, "decorating the constructor", but it doesn't appear to work in FF55's "SpiderMonkey" version of ES2017: I get a message saying the class "requires new".
Doing a bit of googling I found this article. This man talks about a whole bunch of concepts which I wasn't even aware existed in Javascript! My knowledge of JS hasn't gone much beyond the Javascript Definitive Guide 6th Edition, although I do use Promises and async/await a lot (I'm hoping a new edition of the JS Def Guide will come out one day...).
So are there any experts out there who know of a way to, essentially, "enhance" (i.e. re-engineer, not extend) existing JS classes in ES2017?
...ANSWER
Answered 2017-Sep-02 at 08:47Let say you have a class named Original, which has a render method, which you want to update.
QUESTION
I have been learning about ECMAScript 6 Classes, Mixins and other features for the past few days, but I'm not sure if my understanding of use cases is correct. Below is a snippet of an example with Classes, Subclasses and Mixins.
...ANSWER
Answered 2017-Jan-02 at 17:50Hmm..aren't decorators a proposal still? Could be wrong here but I thought this might be a future state (oh the speed at which we need to keep up...)
My understanding is this: in your context, say you wanted "jobs" to be read only. A decorator could fit the bill.
Something like:
QUESTION
I'm using gulp to uglify my files and it works fine for older Javascript.
There has already been a question about how to uglify an ES6-javascript file: how to uglify javascript classes?
That's because my code does not work (classes are ES5 or smth):
...ANSWER
Answered 2017-Aug-07 at 19:08This is documented to a degree in the README for gulp-uglify. For clarity, I've slightly modified the example there to match your snippet.
You need to npm install the pump, gulp-uglify, and uglify-es packages first (along with any other packages your project needs. Then, you can setup your gulp task similar to as follows:
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