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Jun 18th, 2018
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  1. typeof undefined === "undefined"; //true
  2. typeof true === "boolean"; //true
  3. typeof 42 === "number"; //true
  4. typeof "s" === "string"; //true
  5. typeof {a:1} === "object"; //true
  6. typeof Symbol() === "symbol"; //true
  7. typeof null === "null"; //false
  8. typeof null === "object" //true
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