Is it possible to iterate over multiple lists simultaneously using JavaScript? The reason why I am focusing on vue.js is because, if this is possible, I would use it inside HTML tag. EDIT: A brief explanation how I am going to use it. This question is actually related to one that I have already asked before. …
Tag: javascript
node js async/await : why i can’t get the data ? req.body
i am learning about async/await at Node.js to make a restful api and I got a problem in the PUT and PATCH method, where for req.body it can’t display the data that I want here’s the code: controllers/users and this code for router: when I enable mongoose debug, only the findone function is active,…
Testing debounced function in React component with Jest and Enzyme
I am testing a React component using Jest and Enzyme, and am having difficulty testing that a debounced function is called properly (or at all). I’ve simplified the component code below (edited to make code even simpler), link to codepen here I figured that the debounced function test should be pretty s…
How to fix async function which returns `undefined`?
I’m trying to return the count from my database. The count().exec method returns a Promise. I’m trying to resolve it in order to return the value to the user. But it returns undefined. It seems to me I have well used the async/await pattern, so what is wrong? I can’t figure it out. Here my s…
How should I reference assets in angular custom element (Web Components)
I have created a web component and I referenced image from my asset folder in there as below on local everything is fine, I published my custom element to firebase host and javascript, css and asset folder already exist on my host. then I tried to use my web component in another html peage as below and served…
Error: Cannot use GraphQLSchema “[object GraphQLSchema]” from another module or realm
Given the following code: I get this error: Error: Cannot use GraphQLSchema “[object GraphQLSchema]” from another module or realm. Ensure that there is only one instance of “graphql” in the node_modules directory. If different versions of “graphql” are the dependencies of o…
How to extend the javascript Array Class?
I am trying to extend the Array class to add a Sum method to it. This is my code below, what am I doing wrong? Expected output = 10 Answer Start by imagining how you would sum an array (maybe something with reduce). Turn that into a function. Add that as a method on your class. You can use this
Jest unit test: setTimeout not firing in async test
I’m trying to understand how asynchronous testing works in Jest. What I’m trying to do is similar to an example from the Jest documentation. This works fine .. But I want to delay the callback invocations so I tried this …. but the test fails with the message Expected two assertions to be ca…
How to make koa ctx.throw() use application/json rather than text/plain
I have made a custom error handler for my koa app which works beautifully (except for one sticking point) – using ctx.throw() means any stacktrace is emitted to the server logs and also any custom error message is sent in the response. The one problem is that Content-Type header is text/plain but I real…
Unable to change camera / stream for WebRTC call
Source: https://github.com/anoek/webrtc-group-chat-example/blob/master/client.html I’m trying to modify this Webrtc example to add the ability of changing camera (Cross-browser support). Normal usage works perfectly, after changing camera, failed in renegotiation. 1) Get a list of devices via navigator.…