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React map how to remove empty elements?

I have objects, some of these objects have different properties when the map renders empty elements for me https://ibb.co/BGnB0xL How can I remove these empty elements? maybe you need to use filter or something else? JavaScript_Lessons_Objects.js Lesson.jsx I think the problem is clear when I added to the hea…

How can I wait until the functions finish in Reactjs?

Hi I am new to reactjs and I am trying to build button with a function doing some calculation by Reactjs. The logic is, first I will get two lists from database by two functions. After these 2 functions return results and setState, the calculate function will continue and do its job. But somehow the state is …

Javascript attempt to keep sidebar at 100vh at all times

Working on a project requiring old-school CSS support and want to keep <aside> filling up the page by remaining the same height as the <article> element’s box (It may be between a header and footer, in which case it would not extend past them.) Here’s my attempt at dynamically setting …

How do I replace a class for a child element?

I have a piece of code that, while it works perfectly elsewhere, is not working when I try to apply it to a child element. I am trying to simply replace a class in the classList for an i element when the addEventListener(“mouseover” for the parent tag is triggered. Here’s my code: This shoul…