app-node.js

var http_port = ;

var http = require('http');

var htutil = require('./htutil');

var server = http.createServer(function(req, res){

    htutil.loadParams(req, res, undefined);

    if (req.requrl.pathname === '/'){

        require('./home-node').get(req, res);

    }else if (req.requrl.pathname === '/square'){

        require('./square-node').get(req, res);

    }else if (req.requrl.pathname === '/factorial'){

        require('./factorial-node').get(req, res);

    }else if (req.requrl.pathname === '/fibonacci'){

        require('./fibo-node').get(req, res);

    }else if (req.requrl.pathname === '/mult'){

        require('./mult-node').get(req, res);

    }else{

        res.writeHead(, {'Content-Type': 'text/plain'});

        res.end("bad URL" + req.url);

    }

});

server.listen(http_port);

console.log('listening to http://localhost:3000');

htutil.js

var url = require('url');

exports.loadParams = function(req, res, next){

    req.requrl = url.parse(req.url, true);

    req.a = (req.requrl.query.a && !isNaN(req.requrl.query.a))

        ? new Number(req.requrl.query.a)

        : NaN;

    req.b = (req.requrl.query.b && !isNaN(req.requrl.query.b))

        ? new Number(req.requrl.query.b)

        : NaN;

    if(next) next();

}

exports.navbar = function(){

    return ["<div class='navbar'>",

        "<p><a href='/'>home</a></p>",

        "<p><a href='/mult'>Multiplication</a></p>",

        "<p><a href='/square'>Square</a></p>",

        "<p><a href='/factorial'>Factorial</a></p>",

        "<p><a href='/fibonacci'>Fibonacci</a></p>",

        "</div>"].join('\n');

}

exports.page = function(title, navbar, content){

    return ["<html><head><title>{title}</title></head>",

        "<body><h1>{title}</h1>",

        "<table><tr>",

        "<td>{navbar}</td><td>{content}</td>",

        "</tr></table></body></html>"

        ].join('\n')

        .replace(new RegExp("{title}", "gm"), title)

        .replace("{navbar}", navbar)

        .replace("{content}", content);

}

home-node.js

var htutil = require('./htutil');

exports.get = function(req, res){

    res.writeHead(, {'Content-Type': 'text/html'});

    res.end(htutil.page("Math Wizard", htutil.navbar(), "<p>Math Wizard</p>"));

}

square-node.js

var htutil = require('./htutil');

exports.get = function(req, res){

    res.writeHead(, {'Content-Type': 'text/html'});

    var result = req.a * req.a;

    res.end(

        htutil.page("Square", htutil.navbar(), [

            (!isNaN(req.a) ?

                ("<p class='result'>{a} squared = {sq}</p>"

                    .replace("{a}", req.a)

                    .replace("{sq}", req.a * req.a))

                : ""),

            "<p>Enter numbers to see its square</p>",

            "<form name='square' action='/square' method='get'>",

            "A: <input type='text' name='a' /><br/>",

            "<input type='submit' value='Submit' />",

            "</form>"

        ].join('\n'))

    );

}

factorial-node.js

var htutil = require('./htutil');

var math = require('./math');

exports.get = function(req, res){

    res.writeHead(, {'Content-Type': 'text/html'});

    res.end(

        htutil.page("Factorial", htutil.navbar(), [

            (!isNaN(req.a) ?

                ("<p class='result'>{a} factorial = {fact}</p>"

                    .replace("{a}", req.a)

                    .replace("{fact}", math.factorial(Math.floor(req.a))))

                : ""),

            "<p>Enter numbers to see its factorial</p>",

            "<form name='factorial' action='/factorial' method='get'>",

            "A: <input type='text' name='a' /><br/>",

            "<input type='submit' value='Submit' />",

            "</form>"

        ].join('\n'))

    );

}

mult-node.js

var htutil = require('./htutil');

exports.get = function(req, res){

    res.writeHead(, {'Content-Type': 'text/html'});

    var result = req.a * req.b;

    res.end(

        htutil.page("Multiplication", htutil.navbar(), [

            (!isNaN(req.a) && !isNaN(req.b) ?

                ("<p class='result'>{a} * {b} = {result}</p>"

                    .replace("{a}", req.a)

                    .replace("{b}", req.b)

                    .replace("{result}", req.a * req.b))

                : ""),

            "<p>Enter numbers to mutiply</p>",

            "<form name='mult' action='/mult' method='get'>",

            "A: <input type='text' name='a' /><br/>",

            "B: <input type='text' name='b' /><br/>",

            "<input type='submit' value='Submit' />",

            "</form>"

        ].join('\n'))

    );

}

fibo-node.js

var htutil = require('./htutil');

var math = require('./math');

exports.get = function(req, res){

    res.writeHead(, {'Content-Type': 'text/html'});

    res.end(

        htutil.page("Fibonacci", htutil.navbar(), [

            (!isNaN(req.a) ?

                ("<p class='result'>{a} fibonacci = {fibo}</p>"

                    .replace("{a}", Math.floor(req.a))

                    .replace("{fibo}", math.fibonacci(Math.floor(req.a))))

                : ""),

            "<p>Enter numbers to see its fibonacci</p>",

            "<form name='fibonacci' action='/fibonacci' method='get'>",

            "A: <input type='text' name='a' /><br/>",

            "<input type='submit' value='Submit' />",

            "</form>"

        ].join('\n'))

    );

}

fibo2-node.js

var htutil = require('./htutil');

var math = require('./math');

function sendResult(req, res, a, fiboval){

    res.writeHead(, {'Content-Type': 'text/html'});

    res.end(

        htutil.page("Fibonacci", htutil.navbar(), [

            (!isNaN(fiboval) ?

                ("<p class='result'>{a} fibonacci = {fibo}</p>"

                    .replace("{a}", a)

                    .replace("{fibo}", fiboval))

                : ""),

            "<p>Enter numbers to see its fibonacci</p>",

            "<form name='fibonacci' action='/fibonacci' method='get'>",

            "A: <input type='text' name='a' /><br/>",

            "<input type='submit' value='Submit' />",

            "</form>"

        ].join('\n'))

    );

}

exports.get = function(req, res){

    if (!isNaN(req.a)){

        math.fibonacciAsync(Math.floor(req.a), function(val){

            sendResult(req, res, Math.floor(req.a) ,val);

        });

    }else {

        sendResult(req, res, NaN, NaN);

    }

}

math.js

var factorial = exports.factorial = function(n){

    if (n == )

        return ;

    else

        return n * factorial(n-);

}

var fibonacci = exports.fibonacci = function(n){

    if (n === )

        return ;

    else if (n === )

        return ;

    else

        return fibonacci(n-) + fibonacci(n-);

}

var fibonacciAsync = exports.fibonacciAsync = function(n, done){

    if (n == || n == )

        done();

    else {

        process.nextTick(function(){

            fibonacciAsync(n-, function(val1){

                process.nextTick(function(){

                    fibonacciAsync(n-, function(val2){

                        done(val1 + val2);

                    });

                })

            });

        });

    }

}

  

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