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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Setting Default Values for Function Parameters in Older Versions of JavaScript</title> </head> <body> <script> function sayHello(name){ var name = name || 'World'; return 'Hello ' + name + '!'; } document.write(sayHello()); // Hello World! document.write("<br>"); document.write(sayHello('John')); // Hello John! </script> </body> </html>
