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Tag: javascript

Global Count Variable not increasing

For some reason, I cannot get my global variable counter to increase, even when it increases within the function I have the count++ occurring in. My outputted results are different between the text outputted within the function and the text outside of it. Any idea what I am doing wrong here? Shouldn’t t…

Subject call to next causing a strange error

This causes the following error: Cannot read property ‘length’ of undefined If, however, I wrap msg$.next in a function, then it works without any errors. Lambda function Anonymous function Named function They’re all just wrapper functions that seemingly do nothing but call the next function…

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 …