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What is the use of in operator in JavaScript?

王林
Release： 2023-09-17 20:45:03
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The

What is the use of in operator in JavaScript?

operator is used in JavaScript to check if a property exists in an object.

Example

You can try running the following code to learn how to use the in operator in JavaScript−

Live demonstration

<!DOCTYPE html>
<html>
   <body>
      <script>
         var emp = {name:"Amit", subject:"Java"};
         document.write("name" in emp);
         document.write("<br>");
         document.write("subject" in emp);
         document.write("<br>");
         document.write("MAX_VALUE" in Number);
         document.write("<br>");
         document.write("MIN" in Number);
      </script>
   </body>
</html>
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source：tutorialspoint.com
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