'this' keyword question

function {employee (age, salary)

Define dynamic instance variables

This.Age = age;

This.Salary = salary;

}

I see that the 'this' keyword is used to add a dynamic property to the instantiated object.

My question is that I also saw the following code.

function {employee (age, salary)

Define dynamic instance variables

_age = age;

_salary = salary;

}

What is the difference, or is it a question of preference or the naming convention?

Thank you

It's preferences of conventions, and it is not.

With regard to the parameters of class vs functions scopes properties go, I prefer the variables name bearing the same names for reasons of continuity.

In all cases, the use of this is needed, of course, when it is used the same names.

Also, I prefer convention when _variableName is used only for the private variables that have accessors (getters/setters) correspondents. In all other cases, I use just-mixed-case.

However, in some situations, we have flexibility.

For example, let's say we have class:

package
{

          public class SuperClass
          {
                    private var _age:Number;
                    private var _salary:Number;
                    public function SuperClass()
                    {

                    }

                    public function employee(age:Number, salary:Number):void {
                              _age = age;
                              _salary = salary;
                    }

                    public function get age():Number
                    {
                              return _age;
                    }

                    public function set age(value:Number):void
                    {
                              _age = value;
                    }

                    public function get salary():Number
                    {
                              return _salary;
                    }

                    public function set salary(value:Number):void
                    {
                              _salary = value;
                    }

          }

}

In the superclass, the scope has access to _age and _salary directly even if they are private. So - there is no need to use accessors directly.

Now here's a a class that extends the superclass:

package
{
          public class ExtendingClass extends SuperClass
          {

                    public function ExtendingClass()
                    {

                    }

                    public function employee2(age:Number, salary:Number):void
                    {
                              this.age = age;
                              this.salary = salary;
                    }

          }

}

This class doesn't have access to _age and _salary because they are private but the accessors are available. Therefore, we SHOULD use the "this" keyword

Above examples are not very practical but similar situations pop up constantly.

Tags: Adobe Animate

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