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When trying to use Card of Reactstrap I get Warning: React.jsx: type is invalid — expected a string (for built-in components) or a class/function?

I tried to import the Card component from the Reactstrap library, and unfortunately this has resulted in the error below. When I remove the element, the page works again as intended. IMPORTS (IN PROFILE COMPONENT): EXPORT (AT BOTTOM OF PROFILE COMPONENT): In APP.js router: Full Profile component: Answer I thi…

How to wait for another action in redux-saga

I have a few sagas that may finish and then put another action into the store. Some sagas should only execute after others are executed: they must block, or wait until another one is finished. Summarized as follows: I’m trying to maintain as little coupling between sagas, so bonus points for showing me …

How to improve rendering performance with *ngFor in Angular

I am creating a chat app, and performance is slow when a lot of messages are sent at once. The messages show up but the UI becomes unresponsive for a while. Here is a simplified version of the code and how can I fix this? HTML: TS: Answer The best in your case is to control the angular change detection

How to get array index from html element?

Hey In my Vue application I have the opportunity to create several persons: If I want to add more persons, there is a button, which appends more of these person inputs: }, Output of the console.log method in the console (clicked the add button 2 times): Now the following problem: Let’s say for example w…

the right regex for catching a part of url

There are some cases of URLs like below. I need the right regex for catching the “55” or “5” part of those URLs. What I tried was /(?:/category/w+)(/category/)|(d+[^/])/g However, this regex also catches the “3031” in case (3), “30” in case (4). And it cannot ca…