Use class to define constructor function

ES6 provides a new syntax to create objects, using the class keyword.

ES5

var Student = function(name){
    this.name = name;
}

var s1 = new Student('shreyash')
console.log(s1)

Student { name: 'shreyash' }

ES6

class Student {
    constructor(name) {
        this.name = name;
    }
}

var s1 = new Student('shreyash')
console.log(s1)

Student { name: 'shreyash' }

Use getter and setter to control access to an object

class Teacher{
    constructor ( teacher){
        this.teacher = teacher;
    }
    // getter 
    get teacherName(){
        return this.teacher;
    }
    // setter 
    set teacherName(changeTeacher){
        this.teacher = changeTeacher;
    }
}
const t1 = new Teacher('shreyash');
console.log(t1.teacherName)
t1.teacherName = "vaibhav";
console.log(t1.teacherName)

shreyash
vaibhav