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There are some real problems with the quirks of Javascript too even if the examples are not that common. Some JS coders for instance use the oneof pattern and if you then forget somewhere to check if you got a Number instead of a Boolean you can end up with something weird. I have seen it several times.

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JS is a loose type language by definition.

Biggest problem for JS, from the beginning was people start writing without completely understanding it. Even myself seeing my initial JS code feel embarrassed. Noone understand what is or handle loose typing, prototype, closures, functional concepts like currying before coding. I took almost an year to understand same. Although that time there are hardly my resources like now. But I still see, people directly jumping into JS.

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