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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>JavaScript for..in loop to iterate object</title> </head> <body> <pre> <!-- Use pre element for work document.writeln() method --> <script type="text/javascript"> var myObj = { "commercial": ".com", "network": ".net", "organization": ".org", "government": ".gov" }; for(key in myObj){ document.writeln(key + " domain : " + myObj[key]); } </script> </pre> </body> </html>