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Examples
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Function with console in Examples of Javascript 1
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Example 
<!DOCTYPE html>
    <html lang="en-US">
        <head>
            <meta charset="UTF-8">
            <title>function1</title>
        </head>
        <body>
            
            <script>
                function sum(p1,p2){
                    console.log(p1);
                    var p3=(p1===undefined?0:p1)+(p2===undefined?0:p2);
                    return p3;
                    
                }
                console.log(sum());
                document.write("sum:"+sum()+"<br>");
                document.write("sum:"+sum(2)+"<br>");
                document.write("sum:"+sum(5,2)+"<br>");
            </script>
            
        </body>
    </html>
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