'in'
operator is used to check for the existence of a property in an object.
Syntax
property
in object
Above
statement return true if object has given property, else false.
in.html
<!DOCTYPE html> <html> <head> <title>in operator</title> </head> <body> <script type="text/javascript"> var person1 = { firstName: "Hari Krishna", lastName: "Gurram", address: { city: "Bangalore", area: "Marthalli" } }; // Print "person1 has property firstName" if ("firstName" in person1) { document.write("person1 has property firstName <br />"); } else { document.write("person1 don't have property firstName <br />"); } // Print "person1 don't have property country" if ("country" in person1) { document.write("person1 has property country <br />"); } else { document.write("person1 don't have property country <br />"); } </script> </body> </html>
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