teachR | bundles several Shiny web applications for educational use | Data Visualization library
kandi X-RAY | teachR Summary
kandi X-RAY | teachR Summary
teachR is a package for R that bundles several Shiny web applications for educational use. The goal of teachR is to provide teachers and educators with free, easy-to-use and interactive applications for complementing their courses with virtual demonstrations and/or experiments. The Shiny applications in teachR can be launched directly from within R or RStudio. They can also be exported toward a local folder for later deployment on shinyapp.io or on a personal Shiny Server instance. The teachR package is at a very early stage of development. It contains only a few Shiny applications at the moment, but this number is meant to grow with the help of Shiny developers looking to make their educational web applications more easily accessible. If you are a Shiny developer and want to participate, just fork this repository, add your application(s) to the "inst/apps" folder with a properly formatted "info" file (see other apps for examples), and send me a pull request.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of teachR
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QUESTION
I wanna access an array called "currentNode" from the react context, but looks like it does not work. The console error message is the following:
Unhandled Rejection (TypeError): Cannot read property '0' of null.
It seems that I cannot access the currentNode variable from the context. Can you identify the mistake? Help is very much appreciated.
Step 1: Here is the code, how I dispatch it to the context:
...ANSWER
Answered 2020-Jul-16 at 13:11You didn't add value you are trying to use to the context value
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