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Object-Oriented Programming in JavaScript

bookKeyword 'this'

You can refer to the attributes not only outside the class but inside, too, for example, inside methods. To do that, use this keyword. this is like a name of object, but it means the current object, i. e. it refers to the global object.

Let's change current age of the student each time we call happyBirthday() function, and print it:


              
123456789101112131415

            
class Student{
  name = 'June';
  university = 'MIT';
  age = 18;
  gpa;
  sleep(){
    console.log('I am sleeping right now!')
  }
  happyBirthday(){
    this.age += 1;
    console.log('Today is my birthday! I am', this.age, 'yrs old!');
  }
}
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Task

Swipe to start coding

Modify happyBirthday() function: output info about new age and about name of the student. After that, create an object of class Student, and call this method three times to see what happens with age.

Solution

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SectionΒ 1. ChapterΒ 5
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bookKeyword 'this'

You can refer to the attributes not only outside the class but inside, too, for example, inside methods. To do that, use this keyword. this is like a name of object, but it means the current object, i. e. it refers to the global object.

Let's change current age of the student each time we call happyBirthday() function, and print it:


              
123456789101112131415

            
class Student{
  name = 'June';
  university = 'MIT';
  age = 18;
  gpa;
  sleep(){
    console.log('I am sleeping right now!')
  }
  happyBirthday(){
    this.age += 1;
    console.log('Today is my birthday! I am', this.age, 'yrs old!');
  }
}
copy
Task

Swipe to start coding

Modify happyBirthday() function: output info about new age and about name of the student. After that, create an object of class Student, and call this method three times to see what happens with age.

Solution

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 1. ChapterΒ 5
single

single

close

Awesome!

Completion rate improved to 7.69

bookKeyword 'this'

Swipe to show menu

You can refer to the attributes not only outside the class but inside, too, for example, inside methods. To do that, use this keyword. this is like a name of object, but it means the current object, i. e. it refers to the global object.

Let's change current age of the student each time we call happyBirthday() function, and print it:


              
123456789101112131415

            
class Student{
  name = 'June';
  university = 'MIT';
  age = 18;
  gpa;
  sleep(){
    console.log('I am sleeping right now!')
  }
  happyBirthday(){
    this.age += 1;
    console.log('Today is my birthday! I am', this.age, 'yrs old!');
  }
}
copy
Task

Swipe to start coding

Modify happyBirthday() function: output info about new age and about name of the student. After that, create an object of class Student, and call this method three times to see what happens with age.

Solution

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

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