Add JS variable scoping question from #290
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@ -152,6 +152,7 @@ duplicate([1,2,3,4,5]); // [1,2,3,4,5,1,2,3,4,5]
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* What is event loop?
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* What is the difference between call stack and task queue?
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* Explain the differences on the usage of `foo` between `function foo() {}` and `var foo = function() {}`
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* What are the differences between variables created using `let`, `var` or `const`?
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#### Testing Questions:
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