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app/experiments/mongo-connect.js (9 issues)

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1 
'use strict';
2 

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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const {MongoClient} = require('mongodb');


            


            
                                                                        
                            
            
                                    
            
            

                
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MongoClient.connect('mongodb://localhost:27017/JokesApp', (err, db) => {


            


            
                                                                        
                            
            
                                    
            
            

                
                    6
                

                                    
                                                    
                
                
                
    if (err) 


            


            
                                                                        
                            
            
                                    
            
            

                
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        return console.log('unable to connect MongoDB' + err);      


            


                            

                    
                        
                    
                    
                    
                    
                                                                                                                                                        
                        

                            
                            
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Curly braces around statements make for more readable code and help prevent bugs when you add further statements.
                                            

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
Consider adding curly braces around all statements when they are executed conditionally.
This is optional if there is only one statement, but leaving them out can lead to unexpected
behaviour if another statement is added later.


Consider:


if (a > 0)
    b = 42;





If you or someone else later decides to put another statement in, only the first
statement will be executed.


if (a > 0)
    console.log("a > 0");
    b = 42;





In this case the statement b = 42 will always be executed, while
the logging statement will be executed conditionally.


if (a > 0) {
    console.log("a > 0");
    b = 42;
}





ensures that the proper code will be executed conditionally no matter how
many statements are added or removed.


                        

                                                    

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                    8
                

                                    
                                                    
                
                
                
    console.log('Connected to MongoDB Server');


            


            
                                                                        
                            
            
                                    
            
            

                
                    9
                

                                    
                                                    
                
                
                

            


            
                                                                                                            
                            
            
                                    
            
            

                
                    10
                

                                    
                                                    
                
                
                
    // creating a new collection, a table like structure


            


            
                                                                                                            
                            
            
                                    
            
            

                
                    11
                

                                    
                                                    
                
                
                
    db.collection('Jokes').insertOne({


            


            
                                                                                                            
                                                                
            
                                    
            
            

                
                    12
                

                                    
                                                    
                
                
                
        joke : 'Sample joke 2',


            


            
                                                                        
                            
            
                                    
            
            

                
                    13
                

                                    
                                                    
                
                
                
        likes : 0,


            


            
                                                                        
                            
            
                                    
            
            

                
                    14
                

                                    
                                                    
                
                
                
    }, (err, result) => {


            


            
                                                                        
                            
            
                                    
            
            

                
                    15
                

                                    
                                                    
                
                
                
        if (err) 


            


            
                                                                        
                            
            
                                    
            
            

                
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            return console.log('unable to insert data' + err);


            


                            

                    
                        
                    
                    
                    
                    
                                                                                                                                                        
                        

                            
                            
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                            show
                        


                        

                                                                                        




    

        
            Coding Style
            Best Practice
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                                
                            
                        

                                        
Curly braces around statements make for more readable code and help prevent bugs when you add further statements.
                                            

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
Consider adding curly braces around all statements when they are executed conditionally.
This is optional if there is only one statement, but leaving them out can lead to unexpected
behaviour if another statement is added later.


Consider:


if (a > 0)
    b = 42;





If you or someone else later decides to put another statement in, only the first
statement will be executed.


if (a > 0)
    console.log("a > 0");
    b = 42;





In this case the statement b = 42 will always be executed, while
the logging statement will be executed conditionally.


if (a > 0) {
    console.log("a > 0");
    b = 42;
}





ensures that the proper code will be executed conditionally no matter how
many statements are added or removed.


                        

                                                    

                     Loading history...
                

                    


    




                                                                                            




    

        
            Debugging Code
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                        

                                        
console.log looks like debug code. Are you sure you do not want to remove it?
                                                                                                

                    
                                                    

                     Loading history...
                

                    


    




                                                                                    


                    		
                

            
                                                                        
                            
            
                                    
            
            

                
                    17
                

                                    
                                                    
                
                
                
        


            


            
                                                                        
                            
            
                                    
            
            

                
                    18
                

                                    
                                                    
                
                
                
        console.log(JSON.stringify(result.ops, undefined, 2));


            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
0 ignored issues

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                            show
                        


                        

                                                                                        




    

        
            Best Practice
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                        

                                        
There is no return statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding return undefined; explicitly.
                                            

                    
                                                    

                     Loading history...
                

                    


    




                                                                                    


                    		
                

            
                                                                        
                            
            
                                    
            
            

                
                    19
                

                                    
                                                    
                
                
                
    });


            


            
                                                                        
                            
            
                                    
            
            

                
                    20
                

                                    
                                                    
                
                
                

            


            
                                                                                                            
                            
            
                                    
            
            

                
                    21
                

                                    
                                                    
                
                
                
    // one more users collection


            


            
                                                                                                            
                            
            
                                    
            
            

                
                    22
                

                                    
                                                    
                
                
                
    db.collection('Users').insertOne({


            


            
                                                                                                            
                            
            
                                    
            
            

                
                    23
                

                                    
                                                    
                
                
                
        name : 'Ashok Dey',


            


            
                                                                                                            
                                                                
            
                                    
            
            

                
                    24
                

                                    
                                                    
                
                
                
        age : 22,


            


            
                                                        
            
                                    
            
            

                
                    25
                

                                    
                                                    
                
                
                
        location : 'Delhi'


            


            
                                                        
            
                                    
            
            

                
                    26
                

                                    
                                                    
                
                
                
    }, (err, result) => {


            


            
                                                        
            
                                    
            
            

                
                    27
                

                                    
                                                    
                
                
                
        if (err)  


            


            
                                                        
            
                                    
            
            

                
                    28
                

                                    
                                                    
                
                
                
            return console.log('Failed to insert data into the user collection');


            


                            

                    
                        
                    
                    
                    
                    
                                                                                                                                                        
                        

                            
                            
0 ignored issues

                            –
                            show
                        


                        

                                                                                        




    

        
            Debugging Code
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                        

                                        
console.log looks like debug code. Are you sure you do not want to remove it?
                                                                                                

                    
                                                    

                     Loading history...
                

                    


    




                                                                                            




    

        
            Coding Style
            Best Practice
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                                
                            
                        

                                        
Curly braces around statements make for more readable code and help prevent bugs when you add further statements.
                                            

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
Consider adding curly braces around all statements when they are executed conditionally.
This is optional if there is only one statement, but leaving them out can lead to unexpected
behaviour if another statement is added later.


Consider:


if (a > 0)
    b = 42;





If you or someone else later decides to put another statement in, only the first
statement will be executed.


if (a > 0)
    console.log("a > 0");
    b = 42;





In this case the statement b = 42 will always be executed, while
the logging statement will be executed conditionally.


if (a > 0) {
    console.log("a > 0");
    b = 42;
}





ensures that the proper code will be executed conditionally no matter how
many statements are added or removed.


                        

                                                    

                     Loading history...
                

                    


    




                                                                                    


                    		
                

            
                                                        
            
                                    
            
            

                
                    29
                

                                    
                                                    
                
                
                
        


            


            
                                                        
            
                                    
            
            

                
                    30
                

                                    
                                                    
                
                
                
        console.log(JSON.stringify(result.ops, undefined, 2));


            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
0 ignored issues

                            –
                            show
                        


                        

                                                                                        




    

        
            Best Practice
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                        

                                        
There is no return statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding return undefined; explicitly.
                                            

                    
                                                    

                     Loading history...
                

                    


    




                                                                                    


                    		
                

            
                                                        
            
                                    
            
            

                
                    31
                

                                    
                                                    
                
                
                
    });


            


            
                                                        
            
                                    
            
            

                
                    32
                

                                    
                                                    
                
                
                

            


            
                                                        
            
                                    
            
            

                
                    33
                

                                    
                                                    
                
                
                
    // close the database


            


            
                                                        
            
                                    
            
            

                
                    34
                

                                    
                                                    
                
                
                
    db.close();


            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
0 ignored issues

                            –
                            show
                        


                        

                                                                                        




    

        
            Best Practice
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                        

                                        
There is no return statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding return undefined; explicitly.
                                            

                    
                                                    

                     Loading history...
                

                    


    




                                                                                    


                    		
                

            
                                                        
            
                                    
            
            

                
                    35
                

                                    
                                                    
                
                
                
});