Use it if you need to declare a variable globally and modify it in a function and the changed value to be available globally. Probably best to leave comments as well as this would be unusual behaviour. There are likely other ways to achieve your logic as well
Sort of. You should declare it globally BECAUSE you intend to modify it within a localised scope. This is how the js frameworks work. Vue is effectively a Global object which can have it's properties manipulated by the functions within it. but then we are getting into immutability and state management.
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Use it if you need to declare a variable globally and modify it in a function and the changed value to be available globally. Probably best to leave comments as well as this would be unusual behaviour. There are likely other ways to achieve your logic as well
Yes and moreover, it can be dangerous to create global variable in general since you can easily override it
Sort of. You should declare it globally BECAUSE you intend to modify it within a localised scope. This is how the js frameworks work. Vue is effectively a Global object which can have it's properties manipulated by the functions within it. but then we are getting into immutability and state management.