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As we know, input and ouput are crucial to any program. The same goes for JavaScript.
Use these links to find out more (don't forget to try the examples for yourself) and learn before you attempt this test.
Recap on syntax: https://www.w3schools.com/js/js_syntax.asp
Data types: https://www.w3schools.com/js/js_datatypes.asp
Output: https://www.w3schools.com/js/js_output.asp
The CodingTrain (Youtube) is an absolutely fantastic series of videos that explores JavaScript right from the very beginning and through to some very advanced techniques and concepts. Well worth a watch if you are a serious learner: