CS508 GDB 1 Solution and Discussion

[Pak Love]

@ozair said in CS508 GDB 1 Solution and Discussion:

Re: CS508 GDB.1 Solution and Discussion

Total Marks 5
Starting Date Monday, February 15, 2021
Closing Date Tuesday, February 16, 2021
Status Open
Question Title GDB
Question Description
In a programming world, Lambda Expression (i.e. lambda function) is essentially a block of code that can be assigned to a variable, passed as an argument, or returned from a function call. It has been part of several programming languages like Smalltalk, Lisp, Ruby, Scala, Python, Java and C# etc. for quite some time.

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Listing 1: (anonymous method in C# to check if a student is teenager or not)

delegate(Student std) {

return std.Age > 12 && std.Age < 20;

}

While the same functionality can be achieved by using lambda as;

Listing 2: (checking if a student is teenager or not using lambda in C#)

std => std.Age > 12 && std.Age < 20;

Here, we can see that the code has been shortened (i.e. writability increased). However, it makes the code relatively difficult to understand as “std” in listing 2 is ambiguous (i.e. readability decreased). But what about Reliability?

Being a programming language expert, you are required to compare both approaches (i.e. code written with/without lambda) and state which one is better in terms of Reliability in C# programming language.

Anonymous Method Limitations

It cannot contain jump statement like goto, break or continue.
It cannot access ref or out parameter of an outer method.
It cannot have or access unsafe code.
It cannot be used on the left side of the is operator.

[zaasmi]

@ozair said in CS508 GDB 1 Solution and Discussion:

Re: CS508 GDB.1 Solution and Discussion

Total Marks 5
Starting Date Monday, February 15, 2021
Closing Date Tuesday, February 16, 2021
Status Open
Question Title GDB
Question Description
In a programming world, Lambda Expression (i.e. lambda function) is essentially a block of code that can be assigned to a variable, passed as an argument, or returned from a function call. It has been part of several programming languages like Smalltalk, Lisp, Ruby, Scala, Python, Java and C# etc. for quite some time.

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Listing 1: (anonymous method in C# to check if a student is teenager or not)

delegate(Student std) {

return std.Age > 12 && std.Age < 20;

}

While the same functionality can be achieved by using lambda as;

Listing 2: (checking if a student is teenager or not using lambda in C#)

std => std.Age > 12 && std.Age < 20;

Here, we can see that the code has been shortened (i.e. writability increased). However, it makes the code relatively difficult to understand as “std” in listing 2 is ambiguous (i.e. readability decreased). But what about Reliability?

Being a programming language expert, you are required to compare both approaches (i.e. code written with/without lambda) and state which one is better in terms of Reliability in C# programming language.

Anonymous methods can be used as event handlers:

Example: Anonymous Method as Event Handler
saveButton.Click += delegate(Object o, EventArgs e)
{ 
    System.Windows.Forms.MessageBox.Show("Save Successfully!"); 
};

[zaasmi]

@zaasmi said in CS508 GDB 1 Solution and Discussion:

@ozair said in CS508 GDB 1 Solution and Discussion:

Re: CS508 GDB.1 Solution and Discussion

Total Marks 5
Starting Date Monday, February 15, 2021
Closing Date Tuesday, February 16, 2021
Status Open
Question Title GDB
Question Description
In a programming world, Lambda Expression (i.e. lambda function) is essentially a block of code that can be assigned to a variable, passed as an argument, or returned from a function call. It has been part of several programming languages like Smalltalk, Lisp, Ruby, Scala, Python, Java and C# etc. for quite some time.

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Listing 1: (anonymous method in C# to check if a student is teenager or not)

delegate(Student std) {

return std.Age > 12 && std.Age < 20;

}

While the same functionality can be achieved by using lambda as;

Listing 2: (checking if a student is teenager or not using lambda in C#)

std => std.Age > 12 && std.Age < 20;

Here, we can see that the code has been shortened (i.e. writability increased). However, it makes the code relatively difficult to understand as “std” in listing 2 is ambiguous (i.e. readability decreased). But what about Reliability?

Being a programming language expert, you are required to compare both approaches (i.e. code written with/without lambda) and state which one is better in terms of Reliability in C# programming language.

Anonymous methods can also be passed to a method that accepts the delegate as a parameter.

In the following example, PrintHelperMethod() takes the first parameters of the Print delegate:

Example: Anonymous Method as Parameter
public delegate void Print(int value);

class Program
{
    public static void PrintHelperMethod(Print printDel,int val)
    { 
        val += 10;
        printDel(val);
    }

    static void Main(string[] args)
    {
        PrintHelperMethod(delegate(int val) { Console.WriteLine("Anonymous method: {0}", val); }, 100);
    }
}

Output:
Anonymous method: 110

[zaasmi]

@ozair said in CS508 GDB 1 Solution and Discussion:

Re: CS508 GDB.1 Solution and Discussion

Total Marks 5
Starting Date Monday, February 15, 2021
Closing Date Tuesday, February 16, 2021
Status Open
Question Title GDB
Question Description
In a programming world, Lambda Expression (i.e. lambda function) is essentially a block of code that can be assigned to a variable, passed as an argument, or returned from a function call. It has been part of several programming languages like Smalltalk, Lisp, Ruby, Scala, Python, Java and C# etc. for quite some time.

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Listing 1: (anonymous method in C# to check if a student is teenager or not)

delegate(Student std) {

return std.Age > 12 && std.Age < 20;

}

While the same functionality can be achieved by using lambda as;

Listing 2: (checking if a student is teenager or not using lambda in C#)

std => std.Age > 12 && std.Age < 20;

Here, we can see that the code has been shortened (i.e. writability increased). However, it makes the code relatively difficult to understand as “std” in listing 2 is ambiguous (i.e. readability decreased). But what about Reliability?

Being a programming language expert, you are required to compare both approaches (i.e. code written with/without lambda) and state which one is better in terms of Reliability in C# programming language.

Anonymous methods can also be passed to a method that accepts the delegate as a parameter.

In the following example, PrintHelperMethod() takes the first parameters of the Print delegate:

Example: Anonymous Method as Parameter
public delegate void Print(int value);

class Program
{
    public static void PrintHelperMethod(Print printDel,int val)
    { 
        val += 10;
        printDel(val);
    }

    static void Main(string[] args)
    {
        PrintHelperMethod(delegate(int val) { Console.WriteLine("Anonymous method: {0}", val); }, 100);
    }
}

[zaasmi]

@zaasmi said in CS508 GDB 1 Solution and Discussion:

@ozair said in CS508 GDB 1 Solution and Discussion:

Re: CS508 GDB.1 Solution and Discussion

Total Marks 5
Starting Date Monday, February 15, 2021
Closing Date Tuesday, February 16, 2021
Status Open
Question Title GDB
Question Description
In a programming world, Lambda Expression (i.e. lambda function) is essentially a block of code that can be assigned to a variable, passed as an argument, or returned from a function call. It has been part of several programming languages like Smalltalk, Lisp, Ruby, Scala, Python, Java and C# etc. for quite some time.

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Listing 1: (anonymous method in C# to check if a student is teenager or not)

delegate(Student std) {

return std.Age > 12 && std.Age < 20;

}

While the same functionality can be achieved by using lambda as;

Listing 2: (checking if a student is teenager or not using lambda in C#)

std => std.Age > 12 && std.Age < 20;

Here, we can see that the code has been shortened (i.e. writability increased). However, it makes the code relatively difficult to understand as “std” in listing 2 is ambiguous (i.e. readability decreased). But what about Reliability?

Being a programming language expert, you are required to compare both approaches (i.e. code written with/without lambda) and state which one is better in terms of Reliability in C# programming language.

Anonymous methods can access variables defined in an outer function.

Example: Anonymous Method
public delegate void Print(int value);

static void Main(string[] args)
{
    int i = 10;
    
    Print prnt = delegate(int val) {
        val += i;
        Console.WriteLine("Anonymous method: {0}", val); 
    };

    prnt(100);
}

Anonymous method: 110

[zaasmi]

@ozair said in CS508 GDB 1 Solution and Discussion:

Re: CS508 GDB.1 Solution and Discussion

Total Marks 5
Starting Date Monday, February 15, 2021
Closing Date Tuesday, February 16, 2021
Status Open
Question Title GDB
Question Description
In a programming world, Lambda Expression (i.e. lambda function) is essentially a block of code that can be assigned to a variable, passed as an argument, or returned from a function call. It has been part of several programming languages like Smalltalk, Lisp, Ruby, Scala, Python, Java and C# etc. for quite some time.

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Listing 1: (anonymous method in C# to check if a student is teenager or not)

delegate(Student std) {

return std.Age > 12 && std.Age < 20;

}

While the same functionality can be achieved by using lambda as;

Listing 2: (checking if a student is teenager or not using lambda in C#)

std => std.Age > 12 && std.Age < 20;

Here, we can see that the code has been shortened (i.e. writability increased). However, it makes the code relatively difficult to understand as “std” in listing 2 is ambiguous (i.e. readability decreased). But what about Reliability?

Being a programming language expert, you are required to compare both approaches (i.e. code written with/without lambda) and state which one is better in terms of Reliability in C# programming language.

Anonymous methods can access variables defined in an outer function.

Example: Anonymous Method
public delegate void Print(int value);

static void Main(string[] args)
{
    int i = 10;
    
    Print prnt = delegate(int val) {
        val += i;
        Console.WriteLine("Anonymous method: {0}", val); 
    };

    prnt(100);
}

[zaasmi]

@zaasmi said in CS508 GDB 1 Solution and Discussion:

@ozair said in CS508 GDB 1 Solution and Discussion:

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Example: Anonymous Method

public delegate void Print(int value);

static void Main(string[] args)
{
    Print print = delegate(int val) { 
        Console.WriteLine("Inside Anonymous method. Value: {0}", val); 
    };

    print(100);
}
Try it

Inside Anonymous method. Value: 100

[zaasmi]

@ozair said in CS508 GDB 1 Solution and Discussion:

In context of C# programming, a lambda can be used instead of an anonymous method/function where we do not need to provide access modifier, return type and even name of the method. For example, the following anonymous method checks if a student is teenager or not:

Example: Anonymous Method

public delegate void Print(int value);

static void Main(string[] args)
{
    Print print = delegate(int val) { 
        Console.WriteLine("Inside Anonymous method. Value: {0}", val); 
    };

    print(100);
}
Try it