constructor in javascript object code example
Example 1: javascript constructor function
function ClassMates(name,age){
this.name=name;
this.age=age;
this.displayInfo=function(){
return this.name + "is " + this.age + "year's old!";
}
}
let classmate1 = new ClassMates("Mike Will", 15);
classmate.displayInfo(); // "Mike Will is 15 year's old!"
Example 2: constructor in js
A constructor is a function that creates an instance of a class
which is typically called an “object”. In JavaScript, a constructor gets
called when you declare an object using the new keyword.
The purpose of a constructor is to create an object and set values if
there are any object properties present.
Example 3: js constructor object
function Car(make, model, year) {
this.make = make;
this.model = model;
this.year = year;
}
var car1 = new Car('Eagle', 'Talon TSi', 1993);
console.log(car1.make);
// expected output: "Eagle"
Example 4: why do we use Object Constructors
function Tree(name) {
this.name = name
}
let theTree = new Tree('Redwood')
console.log('theTree.constructor is ' + theTree.constructor)