ECMAScript7 interview questions

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If one needs a Set, how do you choose between HashSet vs. TreeSet?”

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If one needs a Set, how do you choose between HashSet vs. TreeSet?” If one needs a Set, how do you choose between HashSet vs. TreeSet?”If one needs a Set, how do you choose between HashSet vs. TreeSet?” If one needs a Set, how do you choose between HashSet vs. TreeSet?

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What variance is imposed on generic type parameters? How much control does Java give you over this?

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What variance is imposed on generic type parameters? How much control does Java give you over this?

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