In a Vue component, I have this: If I call my component without foo: I read false on the console. I would like to get null if the property is not given and the boolean value elsewhere. How can I get this? Answer You could add default value :
Tag: javascript
is it possible to close current tab of browser using java/spring boot
my requirement is to close the current tab using java/Spring boot . is there any way to do this with java. if not . then can we use other language in java to achieve this functionality. Answer The Window. close() method closes the current window, or the window on which it was called. This method can only be c…
Converting an object into numbers
Hello again stack overflow! Another day another rookie question. I have been trying to create my own simple little calculator and so far I have been working on the add function. It is working without errors but its adding values as if they were strings. I have been trying to place Numbers() and parseInt() aro…
how to update the state before rendering the component?
I have this app that adds “persons” to a “phonebook”, and the user can update the person’s phone if the person already exists. but I want to know to handle the problem of when the person was already deleted (i open two tabs and delete a phone in one tab, and I try to “updat…
How can I type in a textarea and have that text be added to a contenteditable div?
I have a <div contenteditable=”true”> and a <textarea> on my page. I need to get the text that is typed in the textarea to be displayed in the div, while keeping the text that was already in the div. I already kind of achieved that with a keyup function on the textarea but it is not wo…
How to convert a magenta.js note sequence to a midi file?
I am trying to convert a note sequence in Magenta.js to a midi file and get an url so users can download it and use that url in my midi-player/visualizer. But I get this error: Answer I solved it by adding: It seems that the notes need a velocity for this code to work. I found the details in this
Why doesn’t the add wait for the timeout promise to resolve?
Trying to play with how promises and async code works by making a calculator that will give me the answer after the given ms. Why isn’t the add function waiting for the timeout? It goes directly to resolve regardless of how many ms I pass in. Omitted reject to make it more clear. Answer You call resolve…
Map two separate arrays by matching object keys to values
Been scratching my head on this one for an entire evening with no solution in sight. Put simply I am querying two arrays from two separate APIs. They return data in following format: API 1 API 2 I need to match the object keys from the second API to the name value of playerInfo from first API so a new
Is the navigation prop immutable / pure? – react navigation v4
I’m using React Navigation v4, and I need to know if the navigation prop is immutable because I want to wrap my component with React.memo For context here is my (hopefully) pure React component: Answer I’m going to answer my own question based on this tweet by Satyajit Sahoo. It’s not immuta…
How to delay get request until async function finishes loading
In my express server, the root get request happens before an async function finishes listing the files from a database, but the get request needs information from the function to properly render the page. How can I have the get request wait until the other function is done? I have looked at other solutions: R…