typeof Symbol() //"symbol"
typeof Number()//"number"
typeof String()//"string"
typeof Function()//"function"
typeof Object() //"object"
typeof Boolean()//"boolean"
typeof null //"object"
typeof undefined//"undefined"
typeof Symbol() //"symbol"
typeof Number()//"number"
typeof String()//"string"
typeof Function()//"function"
typeof Object() //"object"
typeof Boolean()//"boolean"
typeof null //"object"
typeof undefined//"undefined"
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